zygo-, zyg-, -zygous; zygomatico- +

(Greek: yoke, forming pairs; joined, union; or indicating a relationship to a junction; meaning a yoke or crossbar by which two draft animals; such as, oxen could be hitched to a plow or wagon)

dizygous
Pertaining to or derived from two separate zygotes or two separately fertilized eggs; such as, dizygous (fraternal) twins.
duplex zygote
A fertilized ovum which has two identical genes for a given dominant character.
haplozygous, hemizygous
1. Having only one of a pair of genes; for example, an unpaired X chromosome in males.
2. Referring to a single copy of a gene instead of the customary two copies.

All of the genes on the single X chromosome in the male are in the hemizygous state.

hemiazygos vein
An intercepting trunk for the lower left posterior intercostal veins.

It arises from the ascending lumbar vein, passes up on the left side of the vertebrae to the eighth thoracic vertebra, where it may receive the accessory branch, and crosses over the vertebral column to open into the azygos vein.

heterozygosis
The formation of a zygote by the union of gametes of unlike genetic constitution.
heterozygosity, heterozygous
1. The state of possessing different alleles (alternative forms of a gene that can occupy a particular chromosomal locus) at a given locus in regard to a given character.
2. Having genetic variants or dissimilar pairs of genes for any hereditary characteristic; such as, a cell or organism that has two or more different versions alleles (forms of the same gene) of at least one of its genes.

The offspring of such an organism may differ with regards to the characteristics determined by the gene or genes involved, depending on which version of the gene they inherit.

heterozygote
An individual possessing different alleles, or forms of genes, in regard to a given character.
homozygosis
The formation of a zygote by the union of gametes that possess one or more identical alleles.

An allele is one member of a pair or series of genes that occupy a specific position on a specific chromosome.

homozygosity
Having two identical genes at the corresponding loci of homologous chromosomes.
homozygosity
The state of possessing a pair of identical alleles at a given locus.
homozygote, homozygous
Possessing a pair of identical alleles at a given locus or a cell or organism that has two of the same forms of a particular gene for something such as eye color.
merozygote
A bacterial mechanism of gene transfer in which part of the genome, or chromosome complement, is transferred into an intact recipient cell.
monozygotic, monozygosity, monozygous
Pertaining to or derived from one zygote or a single ovum (female reproductive cell or egg); such as, identical monozygotic twins, triplets, etc.
multiplex zygote
A fertilized ovum which does not possess a gene for a given dominant character.
phenozygous
Having a narrow cranium as compared with the width of the face, so that when the skull is seen from above, the zygomatic arches are visible; that is, the bones that form a bridge between the cheekbones and the temporal bones on each side of the skull.