Sex-linked – when phenotype is located on sex chromosome
example → White eyes are sex-linked in fruit flies. Predict the possible phenotypes and genotypes of the offspring of a heterzygous red-eyed female with a red-eyed male.
Multiple alleles – a gene with more than 2 alleles.
example → blood type – 3 alleles that determine blood type:
What are the chances of a woman with AB blood and a man with A blood having a child with O blood?
Whether the dad is homo or heterozygous, there is no chance of the child having O-type blood.
Polygenic traits – traits where 2 or more genus interact to produce the phenotype.