Dominant gene Just one dominant gene in the genotype means that its appearance is seen in the phenotype. Recessive gene A recessive gene is only observed in the phenotype if no dominant gene is ...

you are crossing an individual of a dominant phenotype but unknown genotype to an individual that is homozygous recessive for all relevant genes. Because the "tester" individual makes one known ...

Importantly, they found known genes explain about 84% of cases caused by recessive genetic variants, which was similar across individuals from European and non-European ancestry groups.