In humans, the allele for brown eyes (B) is dominant over the allele for blue ey
Practice Questions
Q1
In humans, the allele for brown eyes (B) is dominant over the allele for blue eyes (b). What is the genotype of a person with blue eyes? (2019)
BB
Bb
bb
bB
Questions & Step-by-Step Solutions
In humans, the allele for brown eyes (B) is dominant over the allele for blue eyes (b). What is the genotype of a person with blue eyes? (2019)
Step 1: Understand that alleles are different forms of a gene. In this case, we have two alleles for eye color: B (brown) and b (blue).
Step 2: Know that the allele for brown eyes (B) is dominant, which means if a person has at least one B allele, they will have brown eyes.
Step 3: Recognize that blue eyes are caused by the recessive allele (b). This means a person must have two copies of the blue eye allele to have blue eyes.
Step 4: Since blue eyes are recessive, the only way for a person to have blue eyes is to have the genotype bb, which means they have two b alleles.
