How Can The Success Of One Group Of Organisms Promote The Adaptive Radiation Of A Second Group??

How can the success of one group of organisms promote the adaptive radiation of a second group? due not so much to the genes themselves, but rather in how genes are expressed during development. by altering the expression of a developmental gene in some parts of the body but not others.

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Which of the following would cast doubt on the asteroid impact hypothesis for the extinction of the dinosaurs?

Which of the following would cast doubt on the asteroid-impact hypothesis for the extinction of the dinosaurs? Generally, the species that die in mass extinctions are less well-adapted than the species that survive. Thus, mass extinctions work to “weed out” unfit species.

What was the probable role of oxygen gas in the early stages of life’s appearance on earth quizlet?

What was the probable role of oxygen gas in the early stages of life’s appearance on Earth? Oxygen gas tends to disrupt organic molecules, so its absence promoted the formation and stability of complex organic molecules on the early Earth.

What is the result of adaptive radiation quizlet?

adaptive radiation is a process in which organisms diversify rapidly into a multitude of new forms, particularly when a change in the environment makes new resources available, creates new challenges and opens environmental niches. You just studied 73 terms!

How were continents formed from Pangaea?

The emergence of plate tectonic theory

According to Wegener’s theory, Earth’s continents once formed a single, giant landmass, which he called Pangaea. Over millions of years, Pangaea slowly broke apart, eventually forming the continents as they are today.

How is the merging of continents to form Pangaea believed to have altered the Earth’s environments at that time?

How is the merging of continents to form Pangaea believed to have altered Earth’s environments at the end of the Paleozoic era? Shallow coastal areas were drained, leading to the extinction of many marine species. 65 million years ago.

What will tend to produce adaptive changes in populations?

Natural selection is a driving force in evolution and can generate populations that are better adapted to survive and successfully reproduce in their environments.

Why is it important to study the movement of Pangaea?

Pangea is important because it once connected all of the continents, allowing animals to migrate between land masses that would be impossible today. … See full answer below.

Which of the following would prevent an organism from becoming part of the fossil record when it dies group of answer choices?

Which of the following would prevent an organism from becoming part of the fossil record when it dies? It is fully decomposed by bacteria and fungi. You just studied 36 terms!

How do scientists calibrate a molecular clock for a group of organisms with known nucleotide sequences?

How do scientists calibrate a molecular clock for a group of organisms with known nucleotide sequences? a. They measure protein differences. Evolutionary rates in proteins are well-known and can be used to check results obtained using nucleotide sequences.

Is the evolutionary history of a species or group of species?

Phylogeny is the evolutionary history of a species or group of related species. Biologists utilize systematics – an analytical approach to understanding the diversity and relationships of organisms both extant and extinct.

Why did mammals experience an increase in diversity shortly after the Cretaceous?

Why did mammals experience an increase in diversity shortly after the Cretaceous? Mammals diversified to take advantage of ecological roles that were previously filled by the dinosaurs.

What would promote adaptive radiation?

Our theoretical analysis supports the hybrid adaptive radiation hypothesis. Our results predict that hybridization may promote adaptive radiation most powerfully when there is moderate genetic differentiation between parental hybridising lineages, and when large fitness valleys separate highly dissimilar novel niches.

Why did mammals experience an increase in?

Why did mammals experience an increase in diversity shortly after the Cretaceous? They took advantage of the habitat gaps left behind by the dying dinosaurs. What is a mass extinction and how many have there been over the past 600 million years?

What is the result of adaptive radiation?

In evolutionary biology, adaptive radiation is a process in which organisms diversify rapidly from an ancestral species into a multitude of new forms, particularly when a change in the environment makes new resources available, alters biotic interactions or opens new environmental niches.

What is adaptive radiation in biology quizlet?

Adaptive Radiation. –The evolution of many diverse species from a common ancestor. Adaptations. -allow them to fill new habitats or roles in their communities. when it occurs.

What is Pangaea and why is it important?

Pangaea is important because it was a super continent that existed when all the continents were joined together.

How did Pangaea affect the evolution of life on Earth?

As continents broke apart from Pangaea, species got separated by seas and oceans and speciation occurred. Individuals that were once able to interbreed were reproductively isolated from one another and eventually acquired adaptations that made them incompatible. This drove evolution by creating new species.

What might have caused the continents to move do you think it is still moving up to present?

Today, we know that the continents rest on massive slabs of rock called tectonic plates. The plates are always moving and interacting in a process called plate tectonics. The continents are still moving today. Some of the most dynamic sites of tectonic activity are seafloor spreading zones and giant rift valleys.

What are good things about Pangea?

Pangaea was the most recent supercontinent to have existed and the first to be reconstructed by geologists. The distribution of fossils across the continents is one line of evidence pointing to the existence of Pangaea.

What evidence supports the past existence of Pangaea?

The rock formations of eastern North America, Western Europe, and northwestern Africa were later found to have a common origin, and they overlapped in time with the presence of Gondwanaland. Together, these discoveries supported the existence of Pangea.

What is Pangaea in science?

Pangea, also spelled Pangaea, in early geologic time, a supercontinent that incorporated almost all the landmasses on Earth. Pangea was surrounded by a global ocean called Panthalassa, and it was fully assembled by the Early Permian Epoch (some 299 million to about 273 million years ago).

What would be something that would cause a population to be adaptive?

Adaptations develop when certain variations or differences in a population help some members survive better than others (Figure below). The variation may already exist within the population, but often the variation comes from a mutation, or a random change in an organism’s genes.

What do biologists mean by adaptive evolution How do we know when adaptive evolution has occurred?

This type of evolution wherein the changes are driven by natural selection is called adaptive evolution. Adaptive evolution pertains to evolutionary changes in an organism that make it suitable to its habitat. The changes result in an increased chance of survival and reproduction.

How does adaptive evolution happen?

Natural selection only acts on the population’s heritable traits: selecting for beneficial alleles and, thus, increasing their frequency in the population, while selecting against deleterious alleles and, thereby, decreasing their frequency. This process is known as adaptive evolution.

What would prevent an organism from becoming a fossil?

For an organism to become a fossil, it must not decompose or be eaten. This can happen if the organism either lives within or is moved to a place where it can be buried and kept from decaying. When an organism is buried quickly, there is less decay and the better the chance for it to be preserved.

How are adaptations beneficial to organisms?

Adaptations help organisms survive and reproduce in any environment, such that organisms can easily move into different environments. Adaptations allow organisms to tolerate dramatic changes in their environment (such as when a lake dries up).

How do scientists use molecular clocks to study evolution?

The molecular clock can also be used for putting a series of evolutionary events into chronological order. This is done by comparing sequences from different species to determine when they last shared a common ancestor, in effect drawing the family tree.

How do scientists calibrate a molecular clock?

What type of mutations do scientists look for in a molecular clock? How do scientists calibrate a molecular clock? They determine the number of mutations accumulated in a gene of a species of known age.

What is the evolutionary history of a group of organisms?

phylogeny, the history of the evolution of a species or group, especially in reference to lines of descent and relationships among broad groups of organisms.

What are two ways organisms can be preserved?

4. Describe two ways an organism can become a fossil without being buried in sediment. Organisms can be preserved in tar, amber or ice.

What are the benefits of using mitochondrial DNA as a molecular clock?

Mitochondrial DNA offers several benefits over nuclear DNA when determining phylogenetic pathways, including: Maternal inheritance – mtDNA is inherited from the mother only, providing a much more direct genetic lineage.

Is the evolutionary history of a group of genetically related organisms?

The evolutionary history of a group of genetically related organisms is called a phylogeny. It includes ancestor species and descendant species. A phylogeny is usually represented by a tree diagram called a phylogenetic tree.

What is the best technique for establishing evolutionary relationships?

Presently, the most accepted method for constructing phylogenetic trees is a method called cladistics. This method sorts organisms into clades, groups of organisms that are most closely related to each other and the ancestor from which they descended.

Why are mammals so successful?

The success of mammals can be explained by three factors. They can can live in all habitats thanks to being warm-blooded, their behaviour is complex and adaptable thanks to their large brains and long period of parental care and their teeth are highly adaptable for a broad range of diets.

What adaptations helped mammals succeed in the Cenozoic era?

As the environment changed to having periods of extreme cold the warm blooded or homeothermic animals were able to better adapt to the environment. Mammals being warm blooded were better able to adapt to the environmental conditions of the Cenozoic Era.

Which factors have been credited with the adaptive radiation of mammals after the extinction of the dinosaurs?

The extinction of dinosaurs at the end of the Cretaceous period contributed to the adaptive radiation of mammals. This is because this extinction opened up ecological niches that had previously been occupied by dinosaurs. Mammals evolved to occupy those niches at the beginning of the Paleogene period.

What might be the reason for the great increase in the number of mammal groups after the end of the Cretaceous period?

There were new environmental habitats and new food resources to exploit. By the end of the Cretaceous, flowering plants had become dominant, providing food for burgeoning populations of insects, which in turn became another high-quality food source for the mammals, along with fruits and berries.

Why did mammals survive when dinosaurs perished?

“It was the huge amount of thermal heat released by the meteor strike that was the main cause of theK/T extinction,” Graham explains, adding that underground burrows and aquatic environments protected small mammals from the brief but drastic rise in temperature.

What animal did mammals evolve from?

The evolution of the mammalian condition

Mammals were derived in the Triassic Period (about 252 million to 201 million years ago) from members of the reptilian order Therapsida.

What is adaptive radiation describe one example of adaptive radiation?

Adaptive radiation is the relatively fast evolution of many species from a single common ancestor. Adaptive radiation generally occurs when an organism enters a new area and different traits affect its survival. An example of adaptive radiation is the development of mammals after the extinction of dinosaurs.

What is adaptive radiation examples?

Adaptive radiations are best exemplified in closely related groups that have evolved in a relatively short time. A striking example is the radiation, beginning in the Paleogene Period (beginning 66 million years ago), of basal mammalian stock into forms adapted to running, leaping, climbing, swimming, and flying.

Why is adaptive radiation important?

Thus, recent adaptive radiations are especially fruitful resources for dissecting the genetic basis of adaptations and speciation. Adaptive radiations have also played a major role in identifying evolutionary trends. This area of study is important because trends imply predictable patterns in evolutionary history.

What is the role of adaptive radiation in the evolution of life and increase in biodiversity?

Because adaptive radiations produce diversification through ecological specialization, they are essential for understanding how ecological forces can drive evolutionary diversification and shape the way species interact with their environments.

What is the result of adaptive radiation quizlet?

adaptive radiation is a process in which organisms diversify rapidly into a multitude of new forms, particularly when a change in the environment makes new resources available, creates new challenges and opens environmental niches. You just studied 73 terms!

What is adaptive radiation give an example quizlet?

Terms in this set (4)

Adaptive radiation. The development of many different forms from an originally homogeneous group of organisms as they fill different ecological niches. Darwin’s finches. Darwin’s finches were finches of the Galapagos Island with different variations of their beaks.

What are the benefits of Pangea?

Pangea is important because it once connected all of the continents, allowing animals to migrate between land masses that would be impossible today. …

How did Pangaea affect the evolution of life on Earth?

As continents broke apart from Pangaea, species got separated by seas and oceans and speciation occurred. Individuals that were once able to interbreed were reproductively isolated from one another and eventually acquired adaptations that made them incompatible. This drove evolution by creating new species.

What factors promote adaptive radiations?

Adaptive radiations can be triggered by extrinsic factors such as the arise of new ecological opportunity via emergence of novel environments, and/or by intrinsic factors (‘key adaptive innovations’) that increase the availability of niches to a diversifying lineage [1–3, 7, 9].

How could plate tectonic movements affect the evolution of life?

A planet with oceans, continents, and plate tectonics maximizes opportunities for speciation and natural selection, whereas a similar planet without plate tectonics provides fewer such opportunities. Plate tectonics exerts environmental pressures that drive evolution without being capable of extinguishing all life.

What are 3 interesting facts about Pangaea?

Pangea was not the only supercontinent that ever existed on our planet. During 3.5 billion years, several other supercontinents believed to be existed and separated due to the constant motion of the Earth’s outer shell. For instance, there were two other supercontinents that had existed before the formation of Pangea.

Did the continents used to be connected?

All Earth’s continents were once combined in one supercontinent, Pangaea. Over millions of years, the continents drifted apart. Sound amazing? Believe it or not, the continents have come together and spread apart at least three times before.

What is Pangaea in science?

Pangea, also spelled Pangaea, in early geologic time, a supercontinent that incorporated almost all the landmasses on Earth. Pangea was surrounded by a global ocean called Panthalassa, and it was fully assembled by the Early Permian Epoch (some 299 million to about 273 million years ago).

What type of geologic evidence provides the greatest support for the hypothesis?

The four pieces of evidence used to support the hypothesis are that the continents seem to fit together like puzzle pieces, there are fossils of the same plants and animals on continents that are now separated by oceans, there are rock formations and mountain ranges on different continents that are similar in age and …

What evidence do you have to support that the continents have moved great distances?

Modern continents hold clues to their distant past. Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed.

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