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.

What is the difference between allele and haplotype?

As nouns the difference between allele and haplotype

is that allele is (genetics) one of a number of alternative forms of the same gene occupying a given position on a chromosome while haplotype is (genetics) a group of alleles that are transmitted together.

Are alleles and heterozygous different?

In a heterozygous genotype, the two different alleles interact with each other. ... The allele that's expressed more strongly is called “dominant,” while the other is called “recessive.” This recessive allele is masked by the dominant one.