OBJECTIVE LIFE SCIENCE
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: -Evolutionary descent and gene similarity are relatively connected with each other. If two species have the same DNA sequence in their genes, this indicates that they are sharing a common ancestor. A. Species A and B shared a relatively recent common ancestor.
Detailed explanation-2: -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.
Detailed explanation-3: -Species B and C are more likely to be closely related because small genetic changes can produce divergent physical appearances, but if many genes have diverged greatly (like in A & B) then the lineages have been separate for a long time.
Detailed explanation-4: -Because the DNA sequence determines a protein’s amino acid sequence, a gene shared by two closely related organisms should have similar, or even identical, amino acid sequences.
Detailed explanation-5: -Orthologs are homologous proteins in two species that arose from a single protein in the common ancestor of those two species.