A pure- breeding tree that produces fruit with 12 seeds, the smallest number of seeds possible, is mated with a pure- breeding tree that produces fruit with 36 seeds, the largest number of seeds possible. This polygenic trait is controlled by two alleles, which both contribute to the phenotype, present at multiple loci. When two F1 individuals are mated, 7 phenotypes result. Which of the following statements is FALSE?
A) One of the additive alleles contributes 2 seeds to the seed content of the fruit. B) There are 3 genes that control this polygenic trait. C) One of the additive alleles contributes 6 seeds to the seed content of the fruit. D) One of the F2 phenotypic classes has 18 seeds. E) The F1 offspring all have 24 seeds.
A scientist is studying insect wing length. An individual from a pure- breeding parental line (P1), for which the VP is 40 mm2, is mated with an individual from a pure- breeding parental line (P2), for which the VP is 80 mm2. This results in F1 progeny that have a VP of 54 mm2. A cross between two F1 progeny results in offspring with a VP of 92 mm. What is the genotypic variance?