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 × rryy ?

Question

Accepted Answer

A. 1. **Determine the $F_1$ genotype and phenotype.**
Given the cross $RRYY 	imes rryy$, all $F_1$ offspring are

$$
RrYy \ (	ext{round, yellow — since both dominant traits are expressed})
$$

2. **Self the $F_1$ heterozygote to get $F_2$.**
Since $R$ and $Y$ assort independently, self-crossing $RrYy 	imes RrYy$ produces the standard

$$
9:3:3:1
$$

phenotypic distribution across four categories.

3. **List the four resulting phenotype categories.**
These four categories are: round-yellow, round-green, wrinkled-yellow, and wrinkled-green.

4. **Match this to the given options.**
Since option A mentions both 'round seeds with yellow cotyledons' and 'wrinkled seeds with yellow cotyledons' as being present among the F2 phenotypes (which is indeed true, since both of these categories do appear, alongside the other two not mentioned),

Hence, the correct answer is **Option A**.

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 F2_22​ generation of the cross RRYY × rryy ?

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 × rryy ?