Your genes are made of DNA. This DNA provides instructions, which determines traits like your hair color and blood type. There are different versions of genes. Each ...

Hemochromatosis is a condition in which too much iron builds up in the body. If a person inherits the condition, it can be heterozygous or homozygous, depending on how many copies of the gene they ...

A test cross is a way to explore the genotpye of an organism. Early use of the test cross was as an experimental mating test used to determine what alleles are present in the genotype. An organism's ...

Homozygous deficiency of alpha 1-atitrypsin is known to predispose to pulmonary emphysema. Measurement of the trypsin inhibitory capacity (TIC) of serum specimens from 28 relatives of a homozygous ...