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If a true breeding rose combed chicken is crossed to walnut combed chicken, what are the only possibilities of the F1 progeny?

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If a true breeding rose combed chicken is crossed to walnut combed chicken, what are the only possibilities of the F1 progeny?

(a) Walnut

(b) Rose

(c) Walnut or rose

(d) Walnut or rose or pea

I have been asked this question in an online quiz.

This intriguing question comes from Gene Interactions topic in division Extension and Deviation from Mendelian Genetic Principles of Cytogenetics

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Best answer
The correct choice is (c) Walnut or rose

The best explanation: Considering the most variable of the condition when the walnut is heterozygous in both the loci it can result in walnut or rose in the ratio of 3:1. In other cases, it can mostly result in walnut while parent heterozygous in P locus could also give a rose.

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