Two P1 generation corn are crossed and the following phenotypic characters are recorded:?

Question

Two P1 generation corn are crossed and the following phenotypic characters are recorded:
Corn kernel color

Corn kernel shape




Color and kernel shape alleles:

P=purple, p=white

R=round, r=wrinkled




We cross a homozygous purple, heterozygous round parent with a heterozygous purple, wrinkled parent. Assuming these alleles obey the law of segregation and independent assortment,

a) What will be the offspring (F1) genotype ratio?

b) What will be the offspring (F1) phenotype ratio?

c) What fraction of offspring (F1) will be homozygous for both characteristics?

d) What fraction of offspring (F1) will be heterozygous for both characteristics?

Answer 1

P1 = PPRr x Pprr

a. F1 offspring can be calculated like this:

PP x Pp yields 1 PP: 1 Pp
Rr x rr yields 1 Rr: 1rr

Combine those two ratios to determine the genotypes of the F1.
1 PPRr: 1PPrr: 1PpRr: 1Pprr

b. The F1 phenotype ratio can be identified by looking at the genotype ratio from part a.
1 purple, round: 1 purple, wrinkled

c. Fraction homozygous for both characteristics = 1/4 (only those that are PPrr which is one out of the four in the genotype ratio)

d. Fraction heterozygous for both characteristics = 1/4

Answer 2

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