Consider Mendel's Experiments Involving the Trait of Round Versus Wrinkled

question 150

Multiple Choice

Consider Mendel's experiments involving the trait of round versus wrinkled peas. In some experiments, Mendel removed the anthers of the flowers from a plant that was true-breeding for round peas and applied pollen from the anthers of a plant that was true-breeding for wrinkled peas. What would have happened if Mendel missed some anthers that he was trying to remove from the true-breeding round pea plants, and then counted the peas produced by a plant that bore a mix of round and wrinkled pollen? Indicate which of the following must be TRUE.

• A)The F₁ peas produced would have mixed phenotypes.
• B)The F₁ peas produced would have a single phenotype.
• C)The F₂ peas would have phenotypes in a 9:3:3:1 ratio.
• D)The F₂ peas would all have the phenotype of the parental plant with the anthers not properly removed.
• E)The F₁ peas would have phenotypes in a 1:1 ratio.

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Definitions:

Widow's Peak

A V-shaped point on the human forehead hairline due to a specific genetic trait.

Straight Hairline

A form of hairline where the hair grows in a straight line across the forehead.

Recessive

A genetic trait that is expressed only when two copies of the gene are present, not seen when a dominant gene is present.

Phenotypic Ratio

The proportion of different phenotypes observed in the offspring of a particular genetic cross.