Question

If a yellow pea had a green parent, then the genotype of the yellow pea must be __________.
YY
Yy
YYrr
yyRR

Answer 1

If a yellow pea had a green parent, we need to consider the inheritance of the color traits in peas as described by Gregor Mendel. Generally, in Mendelian genetics, yellow peas (often represented by the allele "Y") are dominant over green peas (represented by the allele "y").

Since the yellow pea has a green parent, it must have at least one "Y" allele, making its possible genotypes either "YY" (homozygous dominant) or "Yy" (heterozygous). However, since it has a green parent (which must have at least one "y" allele), the yellow pea cannot be "YY." Therefore, the genotype of the yellow pea must be:

**Yy**

So, the correct answer is **Yy**.