Which of the following describes a homozygous genotype?
Practice Questions
Q1
Which of the following describes a homozygous genotype?
Two different alleles for a trait
Two identical alleles for a trait
One dominant and one recessive allele
A trait that is not expressed
Questions & Step-by-Step Solutions
Which of the following describes a homozygous genotype?
Correct Answer: A homozygous genotype consists of two identical alleles.
Step 1: Understand what a genotype is. A genotype is the genetic makeup of an organism, specifically the alleles it has for a particular trait.
Step 2: Learn about alleles. Alleles are different forms of a gene. For example, a gene for flower color might have a red allele and a white allele.
Step 3: Know the difference between dominant and recessive alleles. A dominant allele is one that can mask the effect of a recessive allele. If an organism has one dominant and one recessive allele, the dominant trait will be expressed.
Step 4: Define homozygous. A homozygous genotype means that both alleles for a trait are the same.
Step 5: Identify the types of homozygous genotypes. There are two types: homozygous dominant (both alleles are dominant) and homozygous recessive (both alleles are recessive).
Step 6: Conclude that a homozygous genotype consists of two identical alleles for a trait, either both dominant or both recessive.
