Mendel used pea plants true breeding for yellow peas or green peas in an experiment. all the offspring produced from this cross were yellow. when the offspring were allowed to self pollinate, one out of four produced green peas. what was the genotype of the plants that produced yellow pea f1 generation?

Answer: Yy

Explanation:

Let the allele for yellow color be represented as Y and allele for green color be y.The cross that took place was:

P ---->YY X yy

from this cross

F1-----> Yy Yy Yy Yy

Self-pollination---> YyXYy

F2----> YY Yy Yy yy

Note: Phenotype of YY = yellow

       yy = green

      Yy = yellow

From the cross, we can see that the genotype of the yellow pea in the F1 generation was Yy. We get such results because the dominant allele is Y (yellow) and this is the reason that it inhibits the expression of y (green) allele in the heterozygous condition in the F1 generation.The cross is more clearly represented in the attached diagram.