ABO blood typing two of the above all of the above 2. Traits determined by more than one gene are called pleiotropic polygenic multifactor complex heterogenetity 6. An allele is dominant in one sex but not the other and its expression is caused by hormonal differences in the sexes.
Alleles are recessive but then are triggered by hormonal differences in the sexes.
An allele is dominant only in females but males are recessive and the trait is expressed due to hormonal levels. Colorblindness is a sex-linked trait. Down syndrome Turner syndrome Patau syndrome Jacobs syndrome Edwards syndrome 9. Down Turner Jacobs Klinfelters Patau 10.