2. Three different pure-breeding strains of corn that produce ears with white kernels were crossed to eachother. In each case, the F1 plants were all red, whileboth red and white kernels were observed in the F2generation in a 9:7 ratio. These results are summarized in the following table.F1 F2white-1 × white-2 red 9 red : 7 whitewhite-1 × white-3 red 9 red : 7 whitewhite-2 × white-3 red 9 red : 7 whitea. How many genes are involved in determiningkernel color in these three strains?b. Define your symbols and show the genotypes for thepure-breeding strains white-1, white-2, and white-3.c. Diagram the cross between white-1 and white-2,showing the genotypes and phenotypes of the F1and F2 progeny. Explain the observed 9:7 ratio.
2. Three different pure-breeding strains of corn that produce ears with white kernels were crossed to each
other. In each case, the F1 plants were all red, while
both red and white kernels were observed in the F2
generation in a 9:7 ratio. These results are summarized in the following table.
F1 F2
white-1 × white-2 red 9 red : 7 white
white-1 × white-3 red 9 red : 7 white
white-2 × white-3 red 9 red : 7 white
a. How many genes are involved in determining
kernel color in these three strains?
b. Define your symbols and show the genotypes for the
pure-breeding strains white-1, white-2, and white-3.
c. Diagram the cross between white-1 and white-2,
showing the genotypes and
and F2 progeny. Explain the observed 9:7 ratio.
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