62. Genes A and B are linked on the same chromosome with recombination frequency of 20%. What will be the frequency of offspring with recessive phenotype from a cross between individuals with AB/ab and Ab/aB genotypes?
(A) 20%
(B) 10%
(C) 6%
(D) 4%
(E) 2%

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統計： A(4), B(6), C(3), D(20), E(3) #1122164

詳解 (共 3 筆)

面試倒楣鬼-22幸運上後西

B2 · 2021/06/20

#4818876

AB/ab產生的配子-> AB:ab:Ab:aB = 40% :40%:10%:10%
Ab/aB產生的配子 -> AB:ab:Ab:aB = 10%:10%: 40%:40%
因此湊成aabb的機率是0.4*0.1 = 4%(D)
感覺有吵架申覆空間啦,
題目問recessive phenotype,而非 double-recessive,或aabb, 問題不夠明確