1. Genetics
Mendel’s Work

2. Mendel’s Work
1. Gregor Mendel experimented with hundreds of pea plants to understand the process of heredity.
The passing of traits from parents to offspring
Only PHYSICAL traits can be passed on

3. Mendel’s Experiment Mendel crossed two plants that differed in height
5. In a flower, the female sex cells, or eggs, are produced by the pistil. Pollen, which contains that male sex cells, is produced by the stamen.
6. They were purebreds
Always produce offspring
with the same traits generation
after generation

4. Mendel’s Experiment 7. Experiment Summary
Purebred tall plants are crossed with purebred small plants
F1 offspring are all tall
F1 offspring are allowed to self-pollinate
F2 generation are tall and small

5. Other Traits Studied in Experiment
8. Pod color, seed shape and flower position
9. Two forms of the trait of seed shape are round and wrinkled.

6. Dominant and Recessive Alleles
10. Alleles are different forms of a gene and a trait controlled by a dominant allele shows up in the organism when the allele is present
11. Only pea plants that
have two recessive alleles
for short stems will be
short

7. The Science of Heredity
15. A dominant allele is represented by a capital letter.
16. A recessive allele is represented by a lowercase letter.

8. Mendel’s Work