AP BIOLOGY

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HEREDITY

GENE INTERACTIONS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What are the possible phenotypic ratios of a cross between a Pure Yellow Hybrid Constricted Pea Plant x Pure Green Pure Expanded Pea Plant Note:Yellow and Constricted are dominant traits.
A
9/16 yellow constricted9/16 yellow expanded
B
8/16 Yellow Constricted; 8/16 Yellow Expanded
C
9/16 Yellow Expanded; 3/16 Yellow Constricted; 3/16 Green Expanded ; 1/16 Green Constricted
D
8/16 Green Expanded; 8/16 Green Constricted
Explanation: 

Detailed explanation-1: –The genotypic ratio is 1:2:1, as there is one homozygous individual for each dominant and recessive trait whereas two individuals for the heterozygous dominant trait. Note:-A dominant trait is expressed in both heterozygous and homozygous conditions.

Detailed explanation-2: -The phenotypic ratio for F2 generations in a dihybrid cross between purebred round yellow seed pea plants and wrinkled green seed pea plants is 9:3:3:1. This ratio represents the ratio between seeds as round yellow (YR), round green (yR), wrinkled yellow (Yr) and wrinkled green plants (yr).

Detailed explanation-3: -Complete answer: A dihybrid cross is a cross between two plants that are identical hybrids for two traits. The two plants are heterozygous for two traits. A pure pea plant with green pods is homozygous for dominant traits and a pure short plant with yellow pods is homozygous for recessive traits.

Detailed explanation-4: -The phenotypic ratio of Mendel’s monohybrid cross for height in pea plants in F2 generation was 3 : 1.

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