Gregor mendel and heredity

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Presentation transcript:

Gregor mendel and heredity What laws did Mendel develop? How do genes influence the development of traits?

Mendel’s Laws Genetics – study of inheritance patterns in an organism Traits – characteristics that are inherited Mendel established our current understanding of how traits were inherited He established purebred (or true-breeding) plants to study

Mendel’s Laws Mendel crossed these traits with each other and made observations about the offspring Law of Dominance Traits are either dominant or recessive Dominant traits are always visible if present Recessive traits are only visible if the dominant trait is absent

Mendel’s Laws Law of Segregation Organisms inherit two copies of each gene, one from each parent Organisms donate only one copy to their gametes This means that genes must separate during gamete formation (MEIOSIS)

Mendel’s Laws Organisms can inherit two of the same alleles or different alleles Homozygous – same alleles – either both dominant or both recessive (AA or aa) Heterozygous – different alleles – (Aa)