usmletopper1
Forum Junior
Topics: 13
Posts: 68
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how do first cousins share 1/8 of genes?
in cant figure it out ,
first generation-grand father/grand mother
2nd generation-mother/uncle-----share half their genes
third generations-first cousins-------share 1/4 of genes
am i thinking right?
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| po
Forum Elite
Topics: 39
Posts: 356
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I am trying figure it out too,good thing you brought it up-
[if mistake some one please correct it]
first generation-grand father/grand mother
[1/2];[1/2]would be transmitted to children
2nd generation-mother marries someone outside family-----
[1/2grand father;1/2grand mother]mom;[1/2;1/2]new genes from pop
1/2mom's genes would go to cousin no.1=
1/2 x [1/2grand fatherx1/2grand mother]=1/2 x1/4=1/8
same would apply for cousin no.2 who would get genes in similar way from mom's sibling.
third generations-first cousins-------share 1/8th of genes
dont know whether I am right,
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