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You crossed two heart shaped Shepherd’s purse which is heterozygous at one locus and homozygous recessive at other gene locus, what would be the ratio of heart shaped and narrow in F1?

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You crossed two heart shaped Shepherd’s purse which is heterozygous at one locus and homozygous recessive at other gene locus, what would be the ratio of heart shaped and narrow in F1?

(a) All heart

(b) All narrow

(c) 3:1

(d) 15:1

The question was posed to me by my school teacher while I was bunking the class.

Enquiry is from Duplicate Epistasis topic in section Extension and Deviation from Mendelian Genetic Principles of Cytogenetics

1 Answer

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The correct choice is (a) All heart

For explanation: As the parent is homozygous recessive at one locus and heterozygous at the other, the combinations that are yield would give 3:1 ratio of heart to narrow.

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