A Recessive Trait on an Autosome Will Be Expressed Only

Question

A recessive trait on an autosome will be expressed only if both chromosomes have a recessive gene.

Accepted Answer

This is the basic principle of Mendelian inheritance, known as the law of segregation. If an individual has two copies of a recessive allele on the same autosome, they will express the recessive phenotype. If they have one dominant and one recessive allele, they will express the dominant phenotype.