sex linkage
phenotypic expression of allele linked to the chromosomal sex of an induvidual
gene on X/Y/Z gene
ex there are 23 pairs in humans: 22 autosomes and 1 pair of sex chromosomes
transmission of traits on the different chromosomes
X, Z: transmit many traits
Y: rarely transmit traits
X-linked
Z-linked
poultry only
- determine sex AFTER birth
- feather color and growth
(topic 18)