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The height of a type of bean plant is determined by five unlinked genes called A, B, C, D, and E. Each gene has two alleles: additive (uppercase letter) and nonadditive (lowercase letter). The shortest plants are 130 cm. The tallest plants are 220 cm. The genotypes are known for two bean plants. Plant 1 is genotype AABbccDdEE. Plant 2 is genotype aaBBCcDdEE.
-If these two plants are crossed, could they produce a plant that is taller than either parent? How?
A) No. Even if the progeny plants had seven additive alleles, it is not possible for it to be taller than either of the parents.
B) No. Environmental factors would prevent the offspring of the cross from inheriting additional additive alleles.
C) Yes. It is possible for these plants to produce a plant that has seven or eight additive alleles, making it taller than either parent.
D) Yes. It is possible for the progeny plants to be taller than either parent, but only if a nondisjunction event occurred in either of the parents when making gametes.
E) No. Because the parent plants are homozygous for most of the genes, they will be taller than any progeny plants they produce.

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The height of a type of bean plant is determined by five unlinked genes called A, B, C, D, and E. Each gene has two alleles: additive (uppercase letter) and nonadditive (lowercase letter). The shortest plants are 130 cm. The tallest plants are 220 cm. The genotypes are known for two bean plants. Plant 1 is genotype AABbccDdEE. Plant 2 is genotype aaBBCcDdEE.
-If these two plants are crossed, could they produce a plant that is taller than either parent? How?
A) No. Even if the progeny plants had seven additive alleles, it is not possible for it to be taller than either of the parents.
B) No. Environmental factors would prevent the offspring of the cross from inheriting additional additive alleles.
C) Yes. It is possible for these plants to produce a plant that has seven or eight additive alleles, making it taller than either parent.
D) Yes. It is possible for the progeny plants to be taller than either parent, but only if a nondisjunction event occurred in either of the parents when making gametes.
E) No. Because the parent plants are homozygous for most of the genes, they will be taller than any progeny plants they produce.

Quizplus · Accepted Answer

The progeny can inherit a combination of alleles that results in more additive alleles than either parent, potentially leading to a taller plant.

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