Homozygous/Purebred
An organism who has 2 of the same alleles for a trait (ex. TT or tt)
Homozygous or purebred refers to an individual that has two identical copies of a particular gene. These identical copies are known as alleles. In this case, the individual inherits the same allele from both parents, which means that they are homozygous for that gene.
For instance, if an individual inherits two copies of a dominant allele for a particular gene, then they would be homozygous dominant. If they inherit two copies of a recessive allele, then they would be homozygous recessive.
Homozygosity can affect the expression of certain traits or diseases. In some cases, homozygosity can result in the expression of a certain trait, whereas heterozygosity may not show that trait. For example, an individual who is homozygous dominant for brown eyes will express brown eyes, whereas an individual who is heterozygous for brown eyes may express either brown or blue eyes. On the other hand, homozygosity for certain diseases or disorders can have serious health consequences.
In animal breeding and genetics, homozygous individuals are often used to produce purebred offspring that consistently exhibit certain traits.
More Answers:
Unveiling the Significance of Genotype in Genetics and Evolutionary BiologyUnderstanding Heterozygosity: A Key Concept in Genetics and Inheritance.
Heterozygous and Hybrid Genetics: Explained.