Definition: With the same or identical alleles for a particular trait located at similar loci on paired chromosomes
(genetics) Of, or pertaining to anindividual(or aconditionin acellor anorganism) containing two copies of the sameallelefor a particulartraitlocated at similar positions (loci) on pairedchromosomes
The termhomozygousis used to describe that which has the same or identicalalleles for a particular trait located at similarlocion paired chromosomes (i.e. homologous chromosomes). In a diploid organism, there are two sets of chromosomes. One of the sets comes from the mother and the other set from the father. Each maternal chromosome has a corresponding paternal chromosome to match with based on their loci. When the loci in the matching chromosomes bear the same alleles, it is described ashomozygous. It means that the alleles code for the sametrait.
A ‘homozygous’organismfor a particulartraitis described to possess either a pair ofdominantalleles(e.g. AA) or a pair ofrecessivealleles(e.g. aa). True breeding organisms are homozygous since the trait in question can be held constant as they produce the same phenotypic result.
Word origin:Greekhomo(“same”) +zygous(of azygote)
- homozygosity (noun)
- homozygous (adjective)