question archive Gregor Mendel famously carried out experiments on sweet peas
Gregor Mendel famously carried out experiments on sweet peas
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Gregor Mendel famously carried out experiments on sweet peas. Three naturally occurring varieties of sweet peas have purple, red and white flowers. The flower colour may be assumed to be determined by two genes. The first gene has two alleles: R and r. A sweet pea with one or more R alleles will have red flowers. The second gene also has two alleles: P and p. A sweet pea with no R alleles but with one or more P alleles will have purple flowers. If the sweet pea's alleles are rr and pp, the flowers will be white.
The pollen from a sweet pea that has two P alleles always carries the P allele, whereas the pollen from a sweet pea that has one P and one p allele has a 50/50 chance of carrying either allele. A species of bee visits only purple-flowered sweet peas: seeds that develop from pollination by such a bee carry one allele from the pollen and one from the plant which was pollinated. What is the probability that a seed of this type carries two P alleles?
