Biology · Human Genetics and Population Evolution
Assertion (A): The mtDNA haplogroups M31 and M32 observed in the Onge and Great Andamanese populations represent ancient maternal lineages that have undergone in situ evolution on the Andaman Islands, isolated since the initial Out-of-Africa coastal migration approximately 50-70 thousand years ago. Adda247 Reason (R): Complete mtDNA sequencing revealed that the coding region mutations defining M31 and M32 do not overlap with those of known Indian, East Asian, or Oceanian haplogroups M, N, or R, and surveys of over 6,500 mainland Indian mtDNA sequences confirmed the absence of these specific mutations, indicating phylogenetic independence driven by genetic drift in small, isolated populations. Adda247 Choose the correct option:
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- 1(A) is true, but (R) is false
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- 3Both (A) and (R) are true, but (R) is not the correct explanation of (A)
- 4(A) is false, but (R) is true
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Both (A) and (R) are true, and (R) is the correct explanation of (A)
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