Haemophilic man marries a normal woman. Their offspring will be
A
all haemophilic
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B
all boys haemophilic
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C
all girls haemophilic
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D
all girls are carriers
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Solution
The correct option is D all girls are carriers The genotype representation of a haemophilic male is XhY and the normal female would have a genotype of XX. Females have two X chromosomes. When the allele is present on one of the X chromosome, the female is said to possess the trait but doesn’t show phenotype expression. Such females are known as carriers and lead a normal life. Their genotype is represented by (XhX or XXh). But when both the X chromosomes have a mutated allele, the female is said to be haemophilic. Their genotype is represented by XhXh.
The following cross depicts the offsprings of a haemophilic man married to a normal woman.
Both the female children are carriers, so they will not be diseased, though they possesses the allele. The male children are normal.