EVOLUTION
EVIDENCE FOR EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Shows that structures have lost much or all of their original size and function and have changed over time
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Shows that totally different structures across species must have been inherited from a common ancestor
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Shows that similar structures that are shared by related species must have been inherited from a common ancestor
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Detailed explanation-1: -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-2: -Homologous structures are structures that are similar in related organisms because they were inherited from a common ancestor. These structures may or may not hav e the same function in the descendants. Figure below shows the hands of several different mammals. They all have the same basic pattern of bones.
Detailed explanation-3: -Answer and Explanation: When there are multiple species with homologous structures, this is used to indicate that they have an evolutionary ancestor in common.
Detailed explanation-4: -The homologous structures all have the same bones, humerus, raidus, ulna, carpals, meta carpals and phalanges. This suggests that all of the organisms had a common ancestor, even though a bat’s wing and human’s arm have different functions.
Detailed explanation-5: -Homology is a relationship defined between structures or DNA derived from a common ancestor and illustrates descent from a common ancestor. Analogous structures are physically (but not genetically) similar structures that were not present the last common ancestor.