Gregor Mendel

Father of Modern Genetics

Gregor Mendel

Father of modern Genetics

Mendel’s Experiment

Mendel’s Experiment

• Crossed two tall plants Tall x Tall = All tall

Mendel’s Experiment

• Crossed two short plants– Short x Short = All short

Mendel’s Experiment

• Crossed Tall and Short plants

Tall x Short = All Tall

Tall x Tall = 75% Tall & 25% Short

Mendel’s Experiment

Mendel’s Findings

– There are two factors that control every trait (genes)

– Different forms of those genes are called alleles

Mendel’s Findings

The rule of Dominance.

– Dominant Genes: Some genes dominate over other genes. (Tall) (T)

– Recessive Genes: Some genes are dominated over (Short) (t)

Mendel’s Results

Law of independent assortment

Mendel’s Findings

The Law of Segregation

– The two genes for a trait separate into different gametes (sex cells) during gamete formation (Meiosis)

Important Vocabulary– Genotype:The gene combination an

organism has for a trait.

Homozygous Dominant: Both genes are the dominant Allele (TT)

Homozygous Recessive: Both genes are the recessive allele (tt)

Heterozygous: Both genes are different (Tt)

– Phenotype: How the gene combinations show or are expressed