Question

The average pea pod contains about 7 peas. the round shape of peas is determined by a dominant allele (r). if heterozygous round pea plants (r/r) are self-fertilized, what proportion of pods in the f1 plants will have all round peas?

Answer 1

Since the pea plans are heterozygous they contain one dominant and one recessive allele. When you extrapolate this out we find that 25% of the plants will be homozygous dominant, 50% will be heterozygous, and 25% will be homozygous recessive. So 75% of the plans will have round peas.