In humans, the allele for brown eyes (B) is dominant over the allele for blue ey

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Question: 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)

Options:

Correct Answer: bb

Exam Year: 2019

Solution:

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

In humans, the allele for brown eyes (B) is dominant over the allele for blue ey

Practice Questions

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)

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.

Dominant and Recessive Alleles – Understanding the relationship between dominant and recessive alleles is crucial for determining genotypes based on phenotypes.
Genotype vs. Phenotype – Differentiating between genotype (the genetic makeup) and phenotype (the observable traits) is essential in genetics.

In humans, the allele for brown eyes (B) is dominant over the allele for blue ey

What’s inside this PDF?

In humans, the allele for brown eyes (B) is dominant over the allele for blue ey

Practice Questions

Questions & Step-by-Step Solutions

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