EVOLUTION
EVIDENCE FOR EVOLUTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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species A and B share a relatively recent common ancestor
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species A evolved independently of species B for a long period
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species A is younger than species B
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species A is older than species B
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Detailed explanation-1: -If species A and B have very similar genes and proteins, what is probably true? Species A and B shared a relatively recent common ancestor. The figure below shows the presumed relationships between three insect taxa.
Detailed explanation-2: -Homologous genes For instance, humans, cows, chickens, and chimpanzees all have a gene that encodes the hormone insulin, because this gene was already present in their last common ancestor. In general, the more DNA differences in homologous genes between two species, the more distantly the species are related.
Detailed explanation-3: -If two species have the same DNA sequence in their genes, this indicates that they are sharing a common ancestor.
Detailed explanation-4: -The shared genes are called homologous genes, or genes which share a common ancestry either between or within species.
Detailed explanation-5: -The degree of difference between proteins enables an estimate of the amount of evolution that has taken place since two species developed from a common ancestor. The longer the period of time involved, the greater the number of amino acids that are different.