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

Question

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

If two F1 plants are crossed, what are the expected phenotype distribution in the F2?

Express your answer as three numbers separated by colons.

Express your answer as three numbers separated by colons.

9 blue : 4 purple : 3 red 9 blue : 6 purple : 1 red 1 blue : 2 purple : 1 red 13 blue : 3 purple : 1 red

Explanation / Answer

The genotype of blue coloured flowers is, AaBb.

Cross between AAbb (true breeding for purple), and aaBB (true breeding for purple) will have all the offspring with the genotype AaBb (blue).

If F1 plants are crossed (AaBb* AaBb), the possible genotype of the F2 generation is, 9 blue : 6 purple : 1 red

(AABB, AaBb, AABb, AaBB genotypes are blue, aabb is red and AAbb, aaBB, Aabb, aabB genotypes are purple).

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