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An X-linked recessive trait is never seen in females and affects only the sons of a...

An X-linked recessive trait is never seen in females and affects only the sons of a female carrier, irrespective of the father's genotype. true or false?

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Answer #1

An X-linked trait means that the gene which causes it is located on the X-chromosome while a recessive trait is one which will be observed only under homozygous condition. Combining the two, an X-linked recessive trait is such a form of inheritance in which a mutation in a gene located on the X-chromosome causes the abnormal phenotype only when present in a homozygous condition (for females and hemizygous for males as they carry only a single X chromosomes).

Therefore, the given statement is false. This is because an X-linked recessive trait also affects a female. This happens when the father is suffering from the trait and the mother is heterozygous as females recieve one allele from each parent and they always get their father's X- chromosome. On the other hand,half the sons of a female carrier are affected irrespective of the father's genotype while the other half remain unaffected.

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