Definition

1. Noun:
   • The genetic state of possessing two identical alleles for a particular gene: Homozygosity describes the condition in a diploid organism where the two alleles at a specific gene locus are the same. This state determines the expression of a trait and is a fundamental concept in Mendelian genetics.

Usage Examples

• Noun:
  • The homozygosity of the plant for the red flower allele ensured all offspring would be red.
  • Geneticists studied the population to determine the level of homozygosity for the recessive disorder.
  • Increased homozygosity in a small population can lead to a loss of genetic diversity.

Advanced Usage

• "Complete homozygosity": Refers to an organism or genome where all gene loci possess identical alleles.

  • Through generations of self-fertilization, the strain achieved near-complete homozygosity.

• "Homozygosity mapping": A genetic technique used to locate disease-causing recessive alleles by identifying genomic regions where an affected individual has homozygous segments.

  • Homozygosity mapping was crucial in identifying the gene responsible for the rare condition.

Variants and Related Words

• Homozygote (n): An individual organism that possesses two identical alleles for a specific gene.

  • A homozygote for the dominant allele will express the dominant phenotype.

• Homozygous (adj): The adjective form describing the state of having identical alleles.

  • The homozygous genotype results in a purebred trait.

• Heterozygosity (n): The contrasting state of possessing two different alleles for a particular gene.

Synonyms

• Genetic uniformity (at a specific locus): This phrase can describe the concept in a more general biological context, though it is less precise.

Antonyms

• Heterozygosity: The state of having two different alleles for a particular gene.

Noun

1. the state of being homozygous; having two identical alleles of the same gene