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A Y linked gene ___________________

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A Y linked gene ___________________

(a) Is expressed only when homozygous

(b) Is present near the telomere of long arm in human

(c) Is carried by mother

(d) Expressed only in men

I got this question during an interview.

Asked question is from Sex Linked Inheritance in section Chromosomes and Sex Determination of Cytogenetics

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Right option is (d) Expressed only in men

Easy explanation: A Y linked gene is expressed only in men and never in females as females lack a Y chromosome. It is not expressed in homozygous, rather in hemizygous for as its present only in a single copy. The region near that telomere is common for both sex chromosomes, so it is not sex linked.

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