Question

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

• 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

Answer 1

Answer: (B)

They are uniparental in origin and do not take part in recombination

Answer 2

Mitochondrial DNA (mt-DNA) and the Y chromosome are inherited in a uniparental manner. Mitochondrial DNA is inherited exclusively from the mother, and the Y chromosome is inherited exclusively from the father. They do not undergo genetic recombination, unlike nuclear DNA. This lack of recombination makes them valuable for tracking specific genetic lineages and ancestry over time, making them useful tools in the study of human evolution.

So, the correct option is (B): They are uniparental in origin and do not take part in recombination