Email required. Please note: comment moderation is enabled and may delay your comment. There is no need to resubmit your comment. Notify me of followup comments via e-mail. Written by : Dr. Rae Osborn. User assumes all risk of use, damage, or injury. You agree that we have no liability for any damages. What is Homozygous? Definition: Homozygous is a state in which a particular gene is present as two alleles that are the same, either both are recessive or both are dominant.
Examples of homozygous genotypes: If we use the letter A to represent a dominant allele and a to represent a recessive allele, then the genotype of a homozygous individual could be either AA or aa. Diseases or conditions that occur in the homozygous condition: There are many diseases in humans that are caused by recessive alleles.
What is Heterozygous? Definition: Heterozygous is the state in which each of the two alleles of a gene is different; one is a dominant allele while the other is a recessive allele. Examples of heterozygous genotypes: If A is used to indicate dominance, and a is used to indicate recessiveness, then the genotype of a heterozygote would be given as Aa. Diseases or conditions that occur in the heterozygous condition: The sickle-cell trait can occur in the heterozygous condition; in this form, the allele for sickle-cell is an advantage because it protects people from malaria, but at the same time does not make them ill with sickle-cell.
Difference between Homozygous and Heterozygous? Feedback We've Added New Words! Word of the Day. Meanings Meanings. What does homozygous mean? What is a homozygote? What does heterozygous mean? What is a heterozygote? Where do homozygous and heterozygous come from?
How to use homozygous vs. Examples of homozygous and heterozygous used in a sentence Here are some examples that illustrate the difference between homozygous and heterozygous.
If you have two copies of the allele for blonde hair, you are homozygous for that trait. Having one copy of the allele for blonde hair and one copy of the allele for brown hair makes you heterozygous for hair color. In a heterozygous genotype, the dominant allele overrules the recessive one. Therefore, the dominant trait will be expressed.
This means you can pass it on to your children. The brown eye color allele is dominant over the blue eye allele. This is unlike the allele for blue eyes, which is recessive. You need two identical blue eye alleles in order to have blue eyes. Freckles are tiny brown spots on the skin. The MC1R gene controls freckles. The trait is also dominant. Red hair is a recessive trait. A person who is heterozygous for red hair has one allele for a dominant trait, like brown hair, and one allele for red hair.
They can pass the red hair allele to their future children. Some diseases are caused by mutated alleles. This risk is related to the way dominant and recessive alleles interact. If you were heterozygous for that mutated recessive allele, the normal dominant allele would take over.
The disease may be expressed mildly or not at all. The word "heterozygous" simply means that your biological mother and your biological father, when they contributed their copies of a particular gene to you, they did so in a way so that the DNA sequence is slightly different.
It can be different at one point in the gene, or it can be different at dozens and dozens of different points in the gene. Now, a heterozygous genotype stands in contrast to a homozygous genotype. And in the case of a homozygous genotype, we're talking about a case where we've gotten identical forms of a particular gene from each biological parent.
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