The allele frequency represents the incidence of a gene variant in a population. Alleles are variant forms of a gene that are located at the same position, or genetic locus, on a chromosome.

Genes come in different varieties, called alleles. Somatic cells contain two alleles for every gene, with one allele provided by each parent of an organism. Often, it is impossible to determine ...

1 Homozygous for allele r rr Wrinkled 2 Homozygous for allele R RR Round Plants 2 and 3 both have the same phenotype even though they have different genotypes. This is because the effect of allele ...

Alleles can be dominant or recessive. Dominant alleles will be expressed even if a recessive allele is present. Recessive alleles will be overridden by the presence of a dominant allele.

ApoE is a key genetic risk factor for certain forms of Alzheimer's disease, whose 3 variants (E2, E3, E4) influence the progression of the disease in different ways. People carrying the E4 allele have ...