1. Mendel & Heredity Notes
3b. The genetic basis for Mendel’s laws of segregation and independent assortment.

2. Objectives
Describe the patterns of inheritance that Mendel’s data revealed.
Summarize Mendel’s law of segregation.

3. Vocabulary
Trait
Genetics
Law of segregation

4. Mendel laid the groundwork for genetics.

5. Trait
Characteristic that is inherited.

6. Genetics
Study of the hereditary patterns and variation of organisms.

7. Mendel’s data revealed patterns of inheritance.

8. Mendel controlled the fertilization of his pea plants by removing the male parts, or stamens. He then fertilized the female part, or pistil, with pollen from a different pea plant.

9. Purebred white and purple plants were crossed to create F1.
(Figure on board)

10. Offspring were allowed to self pollinate to create F2.
(Figure on board)

11. White flowers reappear in some offspring.
(Figure on board)

12. Traits that were hidden when parental purebred flowers were crossed reappeared when the F1 generation was allowed to self-pollinate.

13. Law of segregation Mendel’s first law, stating that
Organisms inherit two copies of genes, one from each parent, and
Organisms donate only one copy of each gene in their gametes because the genes separate during gamete formation.