Purebred
Pure
A pair of alleles which are the same are said to be homozygous.
Organisms or genotypes that are homozygous for a specific trait and always produce offspring of the same phenotype are said to be true breeding. This means that when bred with another organism of the same genotype for that trait, all offspring will display the same characteristic.
homozygous = AA & AA Heterozygous = Aa
Homozygous means "the same egg." That refers to identical twins. Identical twins are always the same gender since they have the same chromosomes.
A homozygote is a homozygous organism. An organism can be a heterozygote or a homozygote. "Hetero" means different and "Homo" means the same.
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A homozygous gene has identical alleles. Homozygous means the individual has two copies of the same allele for a particular gene.
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newbee
When the alleles present for a trait are the same, the genes are called homozygous. This means that both alleles for a particular gene are identical. Homozygous individuals can have either two dominant alleles (homozygous dominant) or two recessive alleles (homozygous recessive).
Homozygous means "same" so a homozygous recessive trait would be a same [with parents] trait that is not the stronger trait which is dominant. Dominant is stronger showing trait, recessive is weaker trait. If you are dealing with Punnett squares then tt is homozygous recessive and TT is homozygous dominant. Hope this helped...