Question

When Mendel crossed two pure pea plants, one with green seeds and one with yellow seeds, the F1 progeny had?

1) All green seeds
2) All yellow seeds
3) Some green seeds and some yellow seeds
4) No seeds

Answer 1

When Mendel crossed two pure pea plants with different seed colors, the F1 progeny had all yellow seeds because yellow is the dominant color over green.

Step-by-step explanation:

Mendel's Pea Plant Experiments

When Mendel crossed two pure pea plants, one with green seeds and one with yellow seeds, he observed the patterns of inheritance that appeared in the subsequent generations. Based on Mendel's experiments, we know that yellow seed color is dominant over green seed color. Therefore, the F1 progeny resulting from such a cross had all yellow seeds. Mendel referred to the visible trait (yellow) as the dominant trait, and the hidden trait (green) as the recessive trait.

When these F1 plants, which were hybrids, self-pollinated to produce the F2 generation, a 3:1 ratio of yellow to green seeds appeared. This demonstrated the reappearance of the recessive green-seed trait and validated Mendel's principles of inheritance. In these crosses, plants with yellow seeds could be either homozygous dominant (YY) or heterozygous (Yy), whilst those with green seeds were homozygous recessive (yy).