In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green co - Biology MCQ Biology | ExamTest.live

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In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F_{2} generation of the cross RRYY x rryy ?

A $Only round seeds with green cotyledons$
B $Only wrinkled seeds with yellow cotyledons$
C $Only wrinkled seeds with green cotyledons$
D $Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons$

Solution & Step-by-step Explanation

The cross RRYY \times rryy yields RrYy in F_{1} . Selfing F_{1} produces F_{2} with 4 phenotypes: round-yellow, round-green, wrinkled-yellow, and wrinkled-green. Option D lists some of the expected phenotypes, matching the closest logical choice from the incomplete list.

Try it yourself before checking the explanation above.

In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green cotyledon (yy). What are the expected phenotypes in the F_{2} generation of the cross RRYY x rryy ?

Only round seeds with green cotyledons

Only wrinkled seeds with yellow cotyledons

Only wrinkled seeds with green cotyledons

Round seeds with yellow cotyledons and wrinkled seeds with yellow cotyledons

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