Human ecology
Allele and locus, heterozygous and homozygous

Two important terms in genetics.

A locus is the position on a chromosome occupied by the gene for a particular protein.

Different versions of the gene are called alleles. Alleles may be may be the same on each chromosome pair, in which case the organism is called homozygous for that gene. Organisms with a different allele on each chromosome are heterozygous at that locus.


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Created 14/7/99