In recent years, DNA sequences (nucleotide sequence) of mtDNA and Y chromosomes were considered for the study of human evolution, because?
Correct answer: B. They are uniparental in origin and do not take part in recombination
- A. They are small and therefore, easy to study.
- B. They are uniparental in origin and do not take part in recombination
- C. Their structure is known in greater detail
- D. They can be studied from the samples of fossil remains.
Explanation
Sequence of both mtDNA and Y chromosomes are considered for the study of human evolution because they are uniparental in origin. mtDNA is inherited along with the maternal cytoplasm and the Y chromosome is inherited from the father. So they do not take part in recombination. In addition, mtDNA has a higher mutation rate than nuclear DNA so that it is more useful for short term evolutionary studies.
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