Question

Which of the following relationships has the closest DNA match?

husband - wife

mother - child

father - child

brother - sister

Answer 1

On average, mother - child. They share half the genome and additionally, the mitochondrial / cytoplasmic inheritance.


You can imagine a situation in which a brother and sister share everything except the Y chromosome and one X chromosome. This would be possible but VERY unlikely. On average, brother and sister would share half their chromosomes (I'm not considering crossover here), but could share more, or less.

Answer 2

Mother and child is the best answer

Answer 3

mother +child