1. 11.1 The Work of Gregor Mendel
Lesson Overview
11.1 The Work of
Gregor Mendel

2. The Experiments of Gregor Mendel
Genetics- scientific study of heredity; the delivery of characteristics from parent to offspring.
The modern science of genetics was founded by an Austrian monk named Gregor Mendel. Mendel was in charge of the monastery garden.
He developed the theory of inheritance before
chromosomes were ever observed under the
microscope!

3. Mendel’s Experiment’s
Mendel studied 7 different characteristics of pea plants
Characteristics- heritable feature that varies among individuals ex: flower color
Trait- a specific characteristic of an individual, such as seed color or plant height, and may vary from one individual to another ex: purple
Pea plants are true breeding or self- pollinating
Hybridization: cross breeding of two contrasting varieties
P generation: parental generation
F1 generation: first filial generation
F2…

4. The Role of Fertilization
Hybrids: offspring of crosses between parents with different traits.
Genes: factors that are passed from parent to offspring
Alleles: different forms of a gene
principle of dominance: some alleles are dominant and others are recessive
An organism with at least one dominant allele for a particular form of a trait will exhibit that form of the trait.
An organism with a recessive allele for a particular form of a trait will exhibit that form only when the dominant allele for the trait is not present.

5. The Law of Segregation
When each parent, or F1 adult, produces gametes, the alleles for each gene segregate so that each gamete carries only one allele for each gene.

6. Genetic Vocabulary
Homozygous-identical alleles for a characteristic ex: TT
Heterozygous: two different alleles for a characteristic ex Tt
Dominant: determines the expression
Recessive: will only be seen if both alleles are recessive as in tt
Genotype: genetic makeup (alleles)
Phenotype: observable traits (what you see)