1. GENETIC VARIATION
Sources of Variation

2. WHY DON’T ALL OFFSPRING FROM THE SAME PARENTS LOOK IDENTICAL?
Genetic variation!

3. SOURCES OF VARIATION
1. Crossing Over: when homologous chromosomes exchange parts of chromatids during meiosis
2. Independent Assortment: independent segregation of genes during the formation of gametes
3. Random fertilization: random chance of a specific sperm pairing with a specific egg
4. Mutations: changes in the DNA sequence

4. VARIATION: CROSSING OVER

5. VARIATION: INDEPENDENT ASSORTMENT

6. VARIATION: RANDOM FERTILIZATION

7. VARIATION: MUTATION