Mendel’s Laws of Heredity Why we look the way we look...

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Presentation transcript:

Mendel’s Laws of Heredity Why we look the way we look...

Mendel used peas... b They reproduce sexually b They have two distinct, male and female, sex cells called gametes b Their traits are easy to isolate

Mendel crossed them b Fertilization - the uniting of male and female gametes b Cross - combining gametes from parents with different traits

What Did Mendel Find? b He discovered different laws and rules that explain factors affecting heredity.

Rule of Dominance b The trait that is observed in the offspring is the dominant trait (uppercase) b The trait that disappears in the offspring is the recessive trait (lowercase)

Law of Segregation b Genes appear in pairs on homologous chromosomes b SEPARATED when gametes are formed b Recombine during fertilization

Law of Independent Assortment b The genes for different traits are inherited independently of each other. b Homologous chromosomes move randomly to gametes b Explains why siblings look different

Monohybrid Vs Dihybrid b Monohybrid Cross - crossing parents who differ in only one trait (AA with aa) b Dihybrid Cross - crossing parents who differ in two traits (AAEE with aaee)

Bozeman Tutorial CwxUDTl8

Incomplete Dominance - Blend

Codominance - Both show

Sex-Linked

Sex-Linked

Multiple Alleles - Blood Type

Dihybrid Cross - 2 traits