GENETIC VARIATION Sources of Variation.

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Presentation transcript:

GENETIC VARIATION Sources of Variation

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

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

VARIATION: CROSSING OVER

VARIATION: INDEPENDENT ASSORTMENT

VARIATION: RANDOM FERTILIZATION

VARIATION: MUTATION