0 having two of the same form of gene (= part of a cell containing DNA information) that controls a particular characteristic and is therefore able to pass on that form only -- 純合子的，同型合子的（帶有兩種同型基因的，基因中包含控制細胞某種特性的 DNA 資訊，因此只可遺傳同型基因的特性）
a homozygous cell 純合子細胞
The first explanation is that the alleles which cause disease when homozygous, confer some benefit when heterozygous : this is the overdominance model.
The effect of a homozygous deletion in one of the alleles was correlated with higher antibody responses.
Two hundred and twenty-one independent lines were established by single-pair sibmating for 14 generations rendering independent homozygous lines.
When both loci are homozygous for a resistant allele, worms are highly resistant.
The average growth rate of the four (sometimes three, rarely two) wild-type homozygous (iw/iw) colonies was calculated.
If these metabolic regulators are not involved, the transgenic mice and homozygous (lit\lit) mice would be expected to be identical to their wild-type littermates.
In our case this hypothesis is not likely because no homozygous nulls were observed for the different loci analysed.
This type of plant-pathogen self-regulation is a characteristic of genetically diverse populations and is generally not found in homogeneous, homozygous monocultures.
