Two pure-breeding wheat strains, one producing dark red kernels and the other pr

Question

Two pure-breeding wheat strains, one producing dark red kernels and the other producing white kernels, are crossed to produce F1 with pink kernel color. When an F1 plant is self-fertilized and its seed collected and planted, the resulting F2consist of 160 plants with kernel colors as shown in the table.

I got parts A-C but I'm stuck on part D.

Part A

Based on the F2 progeny, how many genes are involved in kernel color determination?

2

Part B

How many additive alleles are required to explain the five phenotypes seen in the F2?

4

Part C

If alleles that add to kernel pigment are designated with a "1", and alleles that do not add to kernel pigment are designated with a "2", enter the genotypes for the dark red parent and then the genotype for the white parent.

Select one genotype for each parent for a total of two selections.

Part D

Give genotype(s) for the F1.

Select any that apply.

Select any that apply.

Explanation / Answer

Part A:

Two genes are involved in kernel color determination.

Part B:

Four alleles are required to explain the five phenotypes in F2.

Part C:

A is the dominant character, so represent the gene composition like A1A1B2B2.

According to the question, the pure parents are crossed to produce pink offspring. Thus, the dark red phenotype has gene composition A1A1B1B1.

The white phenotype has A2A2B2B2 type of gene composition.

Part D:

The genotype of F1 is A1A2B1B2.

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