A Certain Species of Morning Glories Produces Flowers That Are

question 3

Multiple Choice

A certain species of morning glories produces flowers that are blue, red, or purple. Two pure- breeding purple lines are crossed and produce F1 progeny that all make blue flowers. The F1 allowed to self and produce 320 F2 progeny with the following distribution: 185 blue, 115 purple, an red.
Which the following is NOT consistent with this information?

• A) Blue- flowering plants are either A_bb or aaB_.
• B) The pure- breeding parental parents are homozygous recessive for mutations in two different genes.
• C) Dominant gene interaction appears to result in a 9:6:1 ratio.
• D) Analysis of the F1 and F2 progeny phenotypes suggests epistasis.
• E) Red- flowering plants are homozygous recessive for both genes.

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Straddling

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