The fewer the differences in the amino acid sequence of cytochrome c between two species, the
Correct answer: B. more closely related they are
- A. more distantly related they are
- B. more closely related they are
- C. larger their genomes must be
- D. faster their mutation rate must be
Explanation
Sequence differences accumulate by mutation after two lineages separate, so a small number of differences means little time has passed since they shared an ancestor. Human and chimpanzee cytochrome c is identical, while human and yeast differ at dozens of positions, and the pattern matches the tree built from anatomy and fossils. Genome size is unrelated to relatedness, as many amphibians have genomes far larger than ours.
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About Concept of Evolution
Evolution is the heritable change in populations over generations, driven by mutation, recombination, natural selection, genetic drift and reproductive isolation. Questions examine variation, adaptation, survival and reproduction, speciation, fossil and anatomical evidence, and the difference between individual acclimatization and evolutionary change in a population.
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