The recessive genes located on the X-chromoso | vedclass

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(A) In humans,males are hemizygous for the $X$-chromosome because they possess only one $X$-chromosome $(XY)$.If a recessive gene is present on the $X

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Expressed in males

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(A) In humans,males are hemizygous for the $X$-chromosome because they possess only one $X$-chromosome $(XY)$.If a recessive gene is present on the $X$-chromosome of a male,there is no corresponding allele on the $Y$-chromosome to mask its effect.Therefore,the recessive trait will always be expressed in males.In contrast,females have two $X$-chromosomes $(XX)$,so a recessive gene on one $X$-chromosome is usually masked by the dominant allele on the other $X$-chromosome,unless the female is homozygous recessive.

The recessive genes located on the $X$-chromosome in humans are always:

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Assertion : In humans,the gamete contributed by the male determines whether the child produced will be male or female.
Reason : Sex in humans is a polygenic trait depending upon a cumulative effect of some genes on $X-$ chromosome and some on $Y-$ chromosome.

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