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NEET2003ZoologyEvolutionActual

In recent years, DNA sequences (nucleotide sequence) of m t DNA and Y chromosomes were considered for the study of human evolution, because:

Options

  1. Athey are small and therefore, easy to study
  2. Bthey are uniparental in origin and do not take part an recombination
  3. Ctheir structure is known in greater detail
  4. Dthey can be studied from the samples of fossil remains

Correct answer

B. they are uniparental in origin and do not take part an recombination

Step-by-step solution

Sequence of both m t DNA 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 Y chromosome is inherited from father. So they do not take part in recombination. In addition, mtDNA has a higher mutation rate then nuclear DNA so that it is more useful for short term evolutionary studies. Related Theory The Ychromosomeisinheritedfromthefather; therefore, paternal social class was included in the Y chromosome an

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