1. Human Heredity Chromosomes & Pedigrees

2. Karyotype x

3. Genes located on the X and Y chromosomes are called sex-linked. Only males have the genes on the Y chromosome which boys inherit from their fathers. In males, the X chromosome must come from the mother and they only get one gene for those traits. Sex Linked Traits

4. Sex Linked Punnett 1.Use the sex chromosomes with the allele. 2.Note that female “carriers” are heterozygous. 3.Complete with genotypic & phenotypic ratios (or %)

5. Sex Linked Punnett

7. Human Inheritance: Pedigrees Pedigree – a family tree that records and traces the occurrences of a trait in a family.

8. Pedigree Symbols Unaffected Male Affected MaleAffected Female Unaffected Female

10. Pedigree Practice