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)

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Q: 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)

Solution: A person with blue eyes must have the genotype bb, as blue is recessive.

Steps: 4

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.