Multi-trait Inheritance Example Problems: Pg 212, #1. Pg 214, #3.

Dihybrid Cross A cross involving…? Imagine having a pea plant that is homozygous purple flower (PP) and homozygous round seed (RR) What possible gametes could be produced by this plant?

Dihybrid Cross Imagine having a pea plant that is heterozygous purple flower (Pp) and heterozygous round seed (Rr) What possible gametes could be produced by this plant?

Law of Independent Assortment Pp Rr PR Pr pR pr

Performing a Dihybrid cross If two plants cross that are both heterozygous for purple flowers (Pp) and round seeds (Rr)… What is the ratio of possible genotypes in the offspring? What is the ratio of phenotypes in the offspring?

Probability The ratios from Punnett Squares tell us the probability of an offspring occurring In the previous cross, what is the probability of having an offspring that has purple flowers and wrinkled seeds?

Probability The Product Law Definition: From the previous slide, what is the probability of having two offspring that both have purple flowers and wrinkled seeds?

Sex Linkage

Sex-linked Genes X-linked genes: Color blindness, male-pattern baldness, Hemophilia: XH is normal gene (dominant) Xh is the hemophilia gene (recessive)

Sex-linked Genes If a woman with hemophilia has a child with a normal man, what is the probability that their child will have hemophilia? Make sure you can perform this punnett square.

Pedigrees Page 199, #2 Page 201, #3-4

Pedigree A chart that… Be able to differentiate: Male and female Matings Siblings Who has a disease/trait?

Pedigree

Pedigree Hypercholesterolemia, a dominant autosomal disease