Genetics Traits passed from generation to generation are carried by genes. For a certain type of pea plant, the color of the flower produced by the plant (either red or white) is determined by a pair of genes. Each gene is of one of the types C (dominant gene) or c (recessive gene). Plants for which both genes are of type c (said to have genotype cc) produce white flowers. All other plants—-that is, plants of genotypes CC and Cc—-produce red flowers. When two plants are crossed, the offspring receives one gene from each parent.
Genotype |
Color |
Cc Cc CC |
White Red Red |
(a) Suppose that you cross two pea plants of genotype Cc. What is the probability that the offspring produces white flowers? Red flowers?
(b) Suppose that you have a batch of red-flowering pea plants, of which 60% have genotype Cc and 40% have genotype CC. If you select one of these plants at random and cross it with a white-flowering pea plant, what is the probability that the offspring will produce red flowers?
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