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.

all of the cell's chromosomes are stored inside a structure called the nucleus. Each eukaryotic chromosome is composed of DNA coiled and condensed around nuclear proteins called histones.

The diagram shows the relationship between the cell, its nucleus, the chromosomes in the ... and these are called alleles. The gene for eye colour has an allele for blue eye colour and an allele ...

Each gene might have different forms, and these are called alleles. The diagram shows the relationship between the cell, its nucleus, chromosomes in the nucleus, and genes.

(Image: National Human Genome Research Institute) The discovery of DNA and its double-helix structure was a pivotal moment in the history of genetics. In 1953, James Watson and Francis Crick proposed ...