3 ms·
So it's 1/2 shared dna for siblings, not 1/4th. Only (I think, possibly) it's 1/2 on average instead of being exactly 1/2 as in the case of parents and children
by Udik 11y ago
So it's 1/2 shared dna for siblings, not 1/4th. Only (I think, possibly) it's 1/2 on average instead of being exactly 1/2 as in the case of parents and children.
- jfoutz 11y agoAh, I did the table wrong in my head. You're right. 2 genes, one from father one from mother, sibling A along the top, simbling A down the side. MM MF FM FF MM 1 .5 .5 0 MF .5 1 0 .5 FM .5 0 1 .5 FF 0 .5 .5 1 (4+ .5 * 8 + 0)/16 = 8/16 = 1/2