In corn, three dominant alleles, called A, D, and R must be present to produce colored seeds. Genotype A - D - R - is colored; all others are colorless. A colored plant is crossed with three tester plants of known genotype.

With tester aa dd RR the colored plant produces $50 \%$ colored seeds
With tester aa DD rr it produces $25 \%$ colored
With tester AA dd rr it produces $50 \%$ colored.
What is the genotype of the colored plant?

Question

In corn, three dominant alleles, called A, D, and R must be present to produce colored seeds. Genotype A - D - R - is colored; all others are colorless. A colored plant is crossed with three tester plants of known genotype.

With tester aa dd RR the colored plant produces $50 \%$ colored seeds
With tester aa DD rr it produces $25 \%$ colored
With tester AA dd rr it produces $50 \%$ colored.
What is the genotype of the colored plant?

Accepted Answer

∻Answer∻ ⚹ The genotype of the colored plant is Aa Dd Rr ⚹ ∻Solution∻ ‖ a ⋮ Understanding the cross with tester aa dd RR: Since 50% of the seeds are colored, the colored plant must be heterozygous for the A and D alleles (Aa Dd R-), because a cross with aa dd would only produce colored offspring if the colored plant contributes a dominant allele for both A and D. ‖ ‖ b ⋮ Understanding the cross with tester aa DD rr: Given that 25% of the seeds are colored, the colored plant must be heterozygous for the R allele (Rr), because a cross with rr would only produce colored offspring if the colored plant contributes a dominant R allele, and the 1:3 ratio indicates a single heterozygous pair. ‖ ‖ c ⋮ Understanding the cross with tester AA dd rr: Since 50% of the seeds are colored, the colored plant must be heterozygous for the D allele (Dd), because a cross with dd would only produce colored offspring if the colored plant contributes a dominant D allele. ‖ ∻Key Concept∻ ⚹ In a dihybrid or trihybrid cross involving complete dominance, the phenotypic ratios can be used to infer the genotype of an unknown parent when crossed with a homozygous recessive tester. ⚹ ∻Explanation∻ ⚹ The percentages of colored seeds in the crosses indicate the heterozygosity of the colored plant's genotype. A 50% colored outcome suggests one heterozygous pair, while a 25% colored outcome suggests two heterozygous pairs. By analyzing the crosses with the tester plants, we can deduce the genotype of the colored plant for each gene. ⚹◊What is the possible combination of alleles in the genotype of the colored plant based on the percentages of colored seeds produced in each cross⍭ Generate me a similar question◊

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