Genetics Mendels Work Mendels Work 1 Gregor Mendel

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Genetics Mendel’s Work

Genetics Mendel’s Work

Mendel’s Work • 1. Gregor Mendel experimented with hundreds of pea plants to understand

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

Mendel’s Experiment • Mendel crossed two plants that differed in height – 5. In

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

Mendel’s Experiment • 7. Experiment Summary – Purebred tall plants are crossed with purebred

Mendel’s Experiment • 7. Experiment Summary – Purebred tall plants are crossed with purebred small plants – F 1 offspring are all tall – F 1 offspring are allowed to self-pollinate – F 2 generation are tall and small

Other Traits Studied in Experiment • 8. Pod color, seed shape and flower position

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.

Dominant and Recessive Alleles • 10. Alleles are different forms of a gene and

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

The Science of Heredity • 15. A dominant allele is represented by a capital

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

Mendel’s Work

Mendel’s Work