Listen to pronunciation. (HEH-teh-roh-ZY-gus JEE-noh-tipe) The presence of two different alleles at a particular gene locus. A heterozygous genotype may include one normal allele and one mutated allele or two different mutated alleles (compound heterozygote).
What is a heterozygous genotype example?
If the two versions are different, you have a heterozygous genotype for that gene. … For example, being heterozygous for hair color could mean you have one allele for red hair and one allele for brown hair. The relationship between the two alleles affects which traits are expressed.
Is AA genotype heterozygous?
Two dominant alleles (AA) or two recessive alleles (aa) are homozygous. One dominant allele and one recessive allele (Aa) is heterozygous.
What is a heterozygous allele pair?
Genes come in pairs, called alleles, and each pair is located in a specific position (or locus) on a chromosome. If the two alleles at a locus are identical to each other, they are homozygous; if they are different from one another, they are heterozygous. … When alleles are heterozygous they are unalike in some way.
Is an allele of a gene heterozygous?
An allele is a variant form of a gene. … When an organism is heterozygous at a specific locus and carries one dominant and one recessive allele, the organism will express the dominant phenotype. Alleles can also refer to minor DNA sequence variations between alleles that do not necessarily influence the gene’s phenotype.
Are blue eyes homozygous or heterozygous?
We all have two alleles, or versions, of each gene. Being homozygous for a particular gene means you inherited two identical versions. It’s the opposite of a heterozygous genotype, where the alleles are different. People who have recessive traits, like blue eyes or red hair, are always homozygous for that gene.
What is a heterozygous mutation?
A mutation affecting only one allele is called heterozygous. A homozygous mutation is the presence of the identical mutation on both alleles of a specific gene. However, when both alleles of a gene harbor mutations, but the mutations are different, these mutations are called compound heterozygous.
What is aa heterozygous?
People who are heterozygous (Aa) are not healthy carriers. They have the disorder just like homozygous dominant (AA) individuals. If only one parent has a single copy of a. dominant allele for a dominant disorder, their children will have a 50% chance of.
What are 3 heterozygous examples?
As a second example of a heterozygous trait, consider human blood types. The three allele possibilities are types A, B and O. A and B are codominant; O is recessive. The heterozygote AO gives type A blood, while BO gives type B blood.