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

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

Correct answer: they are uniparental in origin and do not take part in recombination

Solution

mtDNA and Y-chromosome DNA are useful in human evolution because they are inherited uniparentally and usually do not undergo recombination. This lets scientists track maternal and paternal lineages more directly across generations.

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