Principle of Inheritance and VariationHard
Question
A male human is heterozygous for autosomal genrs A and B and is also hemizygous for haemophilic gene h. What proportion of his sperms will be abh ?
Options
A.1/8
B.1/32
C.1/16
D.1/4
Solution
1/4The genotype of human male in question must be Aa Bb XhY.
Hence 2 × 2 × 2 = 8 types of gametes would be formed. AB Xh, ABY, aB Xh.
aBY, AbXh, AbY, abXh, abY
Hence, 1/8 proportion of his sperms would be abh.
Hence 2 × 2 × 2 = 8 types of gametes would be formed. AB Xh, ABY, aB Xh.
aBY, AbXh, AbY, abXh, abY
Hence, 1/8 proportion of his sperms would be abh.
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