GENETICS AND EVOLUTION
EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Australia and Asia were once part of a larger continent
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these organisms developed at the same time
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we can’t conclude anything from this information
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The mammals were able to swim long distances
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Detailed explanation-1: -Fossils of land-dwelling mammals found in both Australia and southern Asia were discovered to have body structures believed to have evolved from a common ancestor. What does this evidence most likely suggest? These organisms were capable of swimming from one continent to the other.
Detailed explanation-2: -Homologous structures provide evidence for common ancestry, while analogous structures show that similar selective pressures can produce similar adaptations (beneficial features). Similarities and differences among biological molecules (e.g., in the DNA sequence of genes) can be used to determine species’ relatedness.
Detailed explanation-3: -The cynodonts, a theriodont group that also arose in the late Permian, include the ancestors of all mammals.
Detailed explanation-4: -Mammals were derived in the Triassic Period (about 252 million to 201 million years ago) from members of the reptilian order Therapsida. The therapsids, members of the subclass Synapsida (sometimes called the mammal-like reptiles), generally were unimpressive in relation to other reptiles of their time.
Detailed explanation-5: -All true animals-members of the kingdom Animalia-are eukaryotic multicellular organisms that share a single common evolutionary ancestor (Fig. 3.4). This last common ancestor was likely a single-celled organism similar to modern day choanoflagellates.