Morning glories can have blue, purple, or red flowers. Flower color is controled

Question

Morning glories can have blue, purple, or red flowers. Flower color is controled by two genes. Blue color is produced when at least one dominant allele is present at both genes, A and B. Purple flowers result when a dominant allele is present at only one of the two gene loci, A or B. Flowers are red when the plant is homozygous for two recessive alleles at each gene (i.e., aabb). Two pure-breeding purple strains are crossed, and all the F1 plants have blue flowers.

1. What are the genotypes of the parental plants?

Check all that apply.

aabb

2. If two F1 plants are crossed, what are the expected phenotypes of the F2?

Check all that apply.

aabb

2. If two F1 plants are crossed, what are the expected phenotypes of the F2?

Check all that apply.

Explanation / Answer

1. The answers are Aabb, aaBb, aaBB and AAbb.

2. If two F1 plants (Blue flowers) are crossed, then all the F2 generation phenotype would be blue only. As all the flowers will have dominant genes at both loci.

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