AP BIOLOGY

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HEREDITY

MONOHYBRID CROSS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Brown eyes are dominant to blue eyes. Determine the genotype and phenotype ratios for a homozygous dominant female and a homozygous dominant male.
A
1:4 BB 2:4 Bb 1:4 bb3:4 Brown eyes 1:4 blue eyes
B
4:4 BB4:4 Brown eyes
C
2:4 BB 2:4 Bb4:4 Brown eyes
D
3:4 BB 1:4 Bb4:4 Brown eyes
Explanation: 

Detailed explanation-1: -Of these three genotypes, only bb, the homozygous recessive genotype, will produce a phenotype of blue eyes. The heterozygous genotype and the homozygous dominant genotype both will produce brown eyes, though only the heterozygous genotype can pass on the gene for blue eyes.

Detailed explanation-2: -Eye color was traditionally described as a single gene trait, with brown eyes being dominant over blue eyes. Today, scientists have discovered that at least eight genes influence the final color of eyes.

Detailed explanation-3: -If these two have a child, there would be a 0% chance of the offspring have blue eyes. The only genotype that this couple could produce is “Bb” which is heterozygous and would express brown eyes only.

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