In corn, three dominant alleles called a, c, and r must be present to produce colored seeds. genotype a/-; c/-; r/- is colored; all others are colorless. a colored plant is crossed with three tester (homozygous) plants of known genotypes. with tester a/a; c/c; r/r the colored plant produces 50% colored seeds; with the tester a/a c/c r/r it produces 25% colored; and with a/a c/c r/r it produces 50 percent colored. what is the genotype of the colored plant?

The genotype of the colored plant is A/a C/C R/r.

Explanation:

The genotype A/-; C/-; R/- is colored; all others are colorless.

A colored plant (A/?; C/?;R/?) is crossed with three tester.

1. The cross A/- C/- R/- X a/a c/c R/R produces 50% colored seeds.

All the seeds will have the R allele, so the original plant is heterozygous for either A/a or C/c.

2. The cross A/- C/- R/-  X  A/A c/c r/r produces 50% colored seeds.

All the seeds will have the A allele, so the original plant is heterozygous for either C/c or R/r.

3. The cross A/-  C/- R/- X a/a C/C r/r  produces 25% colored seeds.

All the seeds will have the C allele, so the original plant is heterozygous for both A/a and R/r (the offspring would be 1/2 Aa x 1 CC x 1/2 Rr ---> 1/4 colored seeds).

The genotype of the colored plant is therefore A/a C/C R/r.

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