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In case of comb shape of a chicken, which of the following when inbred will breed true?

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In case of comb shape of a chicken, which of the following when inbred will breed true?

(a) Rose

(b) Pea

(c) Walnut

(d) Single

This question was addressed to me in final exam.

Enquiry is from Gene Interactions in chapter Extension and Deviation from Mendelian Genetic Principles of Cytogenetics

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The correct option is (d) Single

To explain I would say: This is the case when the chicken is homozygous recessive in both the R and P locus. Thus, they will always breed true.

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