Modern Genetics

9. Lesson Summary

Variants of genes are called alleles.
Genotype is the combination of alleles that an individual has for a certain gene, while phenotype is the appearance caused by the expression of the genotype.
Incomplete dominance and codominance do not fit Mendel’s rules because one allele does not entirely mask the other.
In polygenic inheritance, many genes control a trait with each dominant allele having an additive effect.