1. 6-6 Meiosis and Genetic Variation Sexual Reproduction gives us unique combinations of genes Remember the possible number of chromosomal combinations? -due to (1) independent assortment (2) Random gamete fertilization 8,388,608 OBJECTIVE: Understand causes of genetic diversity (ex. crossing-over) So, you take that number for each parent and multiply them together

2. 6-6 Meiosis and Genetic Variation This is what makes us all genetically unique!! This is where homologous chromosomes exchange segments during Prophase I Figure 6.20 (pg 190) Sometimes occurring many times on the same chromosomes Greater variation occurs during a process called crossing over That gives us over 70 trillion possible combinations of chromosomes

3. 6-6 Meiosis and Genetic Variation How come it appears that some traits are inherited with other traits? The reasoning for some of these trait is due to their genetic linkage – tendency for genes to be inherited together Locus plays a role in this linkage. The closer genes are on the same chromosome the more likely they are to be “linked” Recombination – refers to the mixing of parental alleles

5. 11-3 Mendelian Genetics ROANING