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Mendelian Genetics
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Mendelelian Genetics

Mendelelian Genetics

Slide 2

Gregor Mendel (1822-1884)

Gregor Mendel (1822-1884)

Responsible for the Laws governing Inheritance of Traits

Slide 3

Gregor Johann Mendel

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 20th century

Slide 4

Gregor Johann Mendel

Gregor Johann Mendel

Between 1856 and 1863, Mendel cultivated and tested some 28,000 pea plants

He found that the plants' offspring retained traits of the parents

Called the Father of Genetics"

Slide 5

Site of Gregor Mendels experimental garden in the Czech Republic

Site of Gregor Mendels experimental garden in the Czech Republic

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Mendel stated that physical traits are inherited as particles

Mendel stated that physical traits are inherited as particles

Mendel did not know that the particles were actually Chromosomes & DNA

Particulate Inheritance

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Genetic Terminology

Genetic Terminology

Trait - any characteristic that can be passed from parent to offspring

Heredity - passing of traits from parent to offspring

Genetics - study of heredity

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Types of Genetic Crosses

Types of Genetic Crosses

Monohybrid cross - cross involving a single trait e.g. flower color

Dihybrid cross - cross involving two traits e.g. flower color & plant height

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Punnett Square

Punnett Square

Used to help solve genetics problems

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Punnett Square

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Designer Genes

Designer Genes

Alleles - two forms of a gene (dominant & recessive)

Dominant - stronger of two genes expressed in the hybrid; represented by a capital letter (R)

Recessive - gene that shows up less often in a cross; represented by a lowercase letter (r)

Slide 12

More Terminology

More Terminology

Genotype - gene combination for a trait (e.g. RR, Rr, rr)

Phenotype - the physical feature resulting from a genotype (e.g. red, white)

Slide 13

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