If you cross pea plants that are heterozygous for purple flowers and yellow seeds (PpYy), and you examine 800 offspring for flower and seed color, about how many do you expect to have white flowers and green seeds?

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Quizplus · Accepted Answer

According to the law of segregation, 25% of the offspring should be homozygous recessive for both traits (ppyy), which would result in the expression of the recessive phenotypes for both flower color and seed color (white and green, respectively). Therefore, 25% of 800 offspring is 200, but only half of those (50) would express the double recessive phenotype.

If You Cross Pea Plants That Are Heterozygous for Purple