In Corn R Is a Gene for Red Aleurone;its Recessive

question 13

Multiple Choice

In corn R is a gene for red aleurone;its recessive allele r determines colorless aleurone.A cross is made between a diploid r/r female and a trisomic R/r/r male.If pollen grains with extra chromosomes are inviable,the ratio of red to colorless kernels expected in the progeny would be:

• A)1 red : 5 colorless.
• B)1 red : 2 colorless.
• C)1 red : 1 colorless.
• D)2 red : 1 colorless.
• E)5 red : 1 colorless.

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