Do alleles come in pairs?

Because chromosomes come in pairs for each trait, there will be two possible alleles. These different versions of genes (alleles) occur as the DNA base sequence is different. This combination of alleles for each trait is called the genotype; this can be any combination of two of the available alleles.

Is an allele a pair?

An allele is a variant form of a gene. Some genes have a variety of different forms, which are located at the same position, or genetic locus, on a chromosome. … Each pair of alleles represents the genotype of a specific gene.

Why do alleles occur in pairs?

Alleles can occur in pairs or multiple alleles affecting phenotype of a specific trait. The different versions of alleles occur as DNA base sequence varies. … Such a combination of alleles for each characteristic is a genotype which could be a combination of two of the available alleles.

Do alleles come on the chromosome pairs?

Each chromosome in the pair contains the same genes in the same order, and place, along the length of the chromosome. For a given gene, if the two chromosomes contain the same allele, they, and the organism, are homozygous with respect to that gene.



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What pairs of alleles determine?

The pair of alleles present on an individual’s chromosomes dictates what eye color will be expressed.

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What is a simple definition of an allele?

An allele is one of two or more versions of a gene. An individual inherits two alleles for each gene, one from each parent. If the two alleles are the same, the individual is homozygous for that gene. If the alleles are different, the individual is heterozygous.

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.

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