S EX - LINKED T RAITS

A. What are they? 1. -involve genes that are located on a sex chromosome 2. -Assume on the X unless stated that it’s the y

B. Review: 1. regular chromosomes = autosomes 2. Sex chromosomes = non- autosomes; contain genes that influence development of becoming male/female

C. Inheritance Pattern: 1. genes can still be dominant, recessive, codominant, etc. 2. Females get two copies of the genes because females have two X chromosomes.

3. males get only one copy of each gene because they only have one X chromosome (from mom) 4. if the gene is on the y chromosome (y-linked) males get one copy (from dad) and females do not get the gene at all. 5. passage of sex chromosomes:

D. Examples 1. Hemophilia

2. Color blindness (most common type)

3. Duchenne Muscular Dystrophy

4. Hypertrichosis (Werewolf disease)

E. G ENETIC P ROBLEM EXAMPLES