A Variable Trait in Corn Is the Presence or Absence

question 13

Multiple Choice

A variable trait in corn is the presence or absence of knobs at particular sites on some chromosomes.The allele present on each chromosome determines whether or not that chromosome has a knob.Suppose that one member of each of two pairs of homologs in a corn plant has a knob.If this plant is crossed with a knobless plant, what percentage of the offspring is expected to have only knobless chromosomes?

• A)100%
• B)75%
• C)50%
• D)25%
• E)0%

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