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If a bull doesn’t express the milking factor, where m+ is normal and m is a mutant gene, its genotype is?

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If a bull doesn’t express the milking factor, where m+ is normal and m is a mutant gene, its genotype is?

(a) m+/m+

(b) m+/m

(c) m/m

(d) Can’t be specified

The question was posed to me in quiz.

My enquiry is from Sex Influenced Traits and Sex Limited Traits in portion Chromosomes and Sex Determination of Cytogenetics

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The correct option is (d) Can’t be specified

The explanation: Milking factor is a sex influenced trait that is only expressed in females i.e. cows. Bulls will never express these genes irrespective of their phenotype. Hence, their genotype can’t be specified.

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