In pea plants,purple flower color is dominant to white flower color.If in the P generation,a pure-breeding white flowering pea plant is crossed with a pure-breeding purple flowering pea plant,what will be the expected genotypes of the F₂ generation?

Question

Quizplus · Accepted Answer

According to the given information, the P generation consists of a pure-breeding white flowering plant (ww) and a pure-breeding purple flowering plant (PP). Since purple color is dominant over white color, we can write the genotypes of the parents as WW and PP, respectively.
When these two parents are crossed, their offspring in the F1 generation will be all heterozygous (WwPp) because each parent contributes one dominant allele (W or P) and one recessive allele (w or p).
Now, if we cross the F1 generation individuals among themselves, we can use a Punnett square to find the expected genotype frequencies in the F2 generation:
 
As we can see from this Punnett square, the expected genotype frequencies in the F2 generation are 1/4 WW (homozygous recessive), 1/2 WwPp (heterozygous), and 1/4 PP (homozygous dominant). Therefore, the best choice is E, "¼ homozygous dominant; ½ heterozygous; ¼ homozygous recessive."

In Pea Plants,purple Flower Color Is Dominant to White Flower