Peas in a Pod

1. Peas in a Pod The Story of Heredity

3. A species is a group of the same organisms that share common traits.

4. Within a species, there can be variations.

5. The offspring of organisms inherit traits from their parents. Traits are determined by a combination of genes from each parent.

6. Dominant + Dominant =

7. Dominant + Dominant = Dominant

8. Dominant + Dominant = Dominant Dominant + Recessive =

9. Dominant + Dominant = Dominant Dominant + Recessive = Dominant

10. Dominant + Dominant = Dominant Dominant + Recessive = Dominant Recessive + Recessive =

11. Dominant + Dominant = Dominant Dominant + Recessive = Dominant Recessive + Recessive = Recessive

12. In 1805, an Austrian monk named Gregor Mendel began a series of experiments with garden peas to determine why some pea plants had different physical characteristics than others. For more than ten years, Mendel carried out thousands of experiments on pea plants that laid the foundation for the study of heredity.

13. Mendel’s decision to study peas is significant. Pea plants are a good choice for study because they produce a large number of offspring and it is easy to control their pollination. Pea plants also have many traits that exist in only two forms.

14. Pea Plant Traits

15. What did Mendel discover? Traits are not blended, but rather passed on intact. Traits can skip a generation. Traits are either dominant or recessive. Traits are passed on independently of other traits.

16. In 1905, English geneticist Reginald Punnett created what is now known as the Punnett square to illustrate some of Mendel’s discoveries. A Punnett square is a chart that shows all possible gene combinations in a cross of parents.

17. TT= pure tall Tt = hybrid tall tt= pure short