Gregor Mendel 1822 1884 The Father of Genetics

Gregor Mendel (1822 -1884) The Father of Genetics copyright cmassengale

Gregor Johann Mendel §Austrian monk §Studied the inheritance of traits in pea plants §Developed the laws of inheritance §Mendel's work was not recognized until the turn of the 20 th century 2

Mendel and His Peas Mendel crossed flowers that were truebreeding for each characteristic. He crossed a purple (PP) flowered plant with a white (pp) flowered plant. (Parent Generation)

Mendel and His Peas Where did the white color go? White Parent The first generation (F 1) of plants all had purple flowers. (pp) Purple Parent (PP) (Pp)

Mendel and His Peas In the second generation (F 2) he had 3 purple flowered plants, and 1 white flowered plant. (Pp) Purple Parent Mendel took two of his first generation (F 1 x F 1) purple flowered plants and crossed them together. (PP) (Pp) (pp)

Mendel and His Peas Mendel noticed in the first generation, all of the white flowers seemed to disappear. He called this a recessive trait. The white color faded into the background at first. It showed up in the next generation when he pollinated the flowers.

Mendel and His Peas The color (purple) that seemed to mask over the recessive color was named the dominant trait.

Mendel and His Peas Mendel was responsible for figuring out that each plant carried two sets of instructions for each characteristic (one from the “mom” and one from the “dad”). Like many scientists, his work was not accepted until after his death.

Science Humor

Mendel and His Peas Vocabulary 1. Heredity- the passing of traits from parent to offspring. 2. First-generation- the very first set of offspring from two parents

Mendel and His Peas 3. Dominant trait- the trait observed when at least one dominant allele for a characteristic is inherited 4. Recessive trait- a trait that is apparent only when two recessive alleles for the same characteristic are inherited

Mendel and His Peas 5. Genes- a segment of DNA that carries hereditary instructions and is passed from parent to offspring 6. Alleles- multiple forms of the same gene

Mendel and His Peas 7. Genotype- an organisms inherited combination of alleles 8. Phenotype- an organisms inherited appearance

What did Mendel miss?