What is sex limited trait and incomplete dominance
Sex influenced and limited traits
Sex influenced traits: The phenotypic expression of the trait is influenced by the sex of the individual e.g pattern baldness (B1 codes for baldness) B1 is dominant in males and recessive in female so B1B1 males/females bald, B1B2 males bald, females not, B2B2 males/females not bald.
The gene for early onset male pattern baldness (MPB) is also associated with Poly Cystic Ovary Diseas in females. Male carriers of the mutation in a gene which affects androgen production had early onset MPB, females had PCOD.
Sex limited traits: phenotype limited to one sex but can be passed to offspring by either sex
e.g precocious puberty in males &cock feathering in fowl
e.g Breast cancer - Two genes identified in the of breast cancers which are (familial) inherited
BRCA1 mutations sex limited to females
BRCA2 mutations expressed in both sexes
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