If the two alleles are the same, the individual is homozygous for that gene. If the alleles are different, the individual is heterozygous. Though the term allele was originally used to describe variation among genes, it now also refers to variation among non-coding DNA sequences.
What is it called when alleles are the same?
Genotypes are described as homozygous if there are two identical alleles at a particular locus and as heterozygous if the two alleles differ. Alleles contribute to the organism’s phenotype, which is the outward appearance of the organism.
Is homozygous when the alleles are the same?
If the alleles are identical, you’re homozygous for that specific gene. For instance, it could mean you have two alleles for the gene that causes brown eyes. Some alleles are dominant, while others are recessive.
When 2 alleles are the same the genotype is considered to be?
A particular genotype is described as homozygous if it features two identical alleles and as heterozygous if the two alleles differ.
What is the best definition of allele?
Allele, also called allelomorph, any one of two or more genes that may occur alternatively at a given site (locus) on a chromosome. Alleles may occur in pairs, or there may be multiple alleles affecting the expression (phenotype) of a particular trait.
Where do alleles come from?
One allele for every gene in an organism is inherited from each of that organism’s parents. In some cases, both parents provide the same allele of a given gene, and the offspring is referred to as homozygous (“homo” meaning “same”) for that allele.
What pairs of alleles determine?
The pair of alleles present on an individual’s chromosomes dictates what eye color will be expressed.