A dark-red strain and a white strain of wheat are crossed and produce an intermediate, medium-red F1. When the F1 plants are interbred, an F2 generation is produced in a ratio of 1 dark-red: 4 medium-darkred: 6 medium-red: 4 light-red: 1 white. Further crosses reveal that the dark-red and white F2 plants are true breeding. (a) Based on the ratios in the F2 population, how many genes are involved in the production of color? (b) How many additive alleles are needed to produce each possible phenotype? (c) Assign symbols to these alleles, and list possible genotypes that give rise to the medium-red and light-red phenotypes. (d) Predict the outcome of the F1 and F2 generations in a cross between a true-breeding medium-red plant and a white plant
A dark-red strain and a white strain of wheat are crossed and produce
an intermediate, medium-red F1. When the F1 plants are interbred,
an F2 generation is produced in a ratio of 1 dark-red: 4 medium-darkred:
6 medium-red: 4 light-red: 1 white. Further crosses reveal that
the dark-red and white F2 plants are true breeding.
(a) Based on the ratios in the F2 population, how many genes are
involved in the production of color?
(b) How many additive alleles are needed to produce each possible
phenotype?
(c) Assign symbols to these alleles, and list possible genotypes
that give rise to the medium-red and light-red
(d) Predict the outcome of the F1 and F2 generations in a cross
between a true-breeding medium-red plant and a white plant
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