Probability and Genetics

Probability The likelihood that a particular event will occur. Example: Coin Toss 1 in 2 ½ 50%

Mendel and Probability Crossing two hybrids (Bb) ¾ had purple flowers ¼ of the plants had white flowers Percentages?

Genotypes VS. Phenotype A phenotype describes an organisms physical traits or appearance. Example: brown hair A genotype is the genetic make up of the organism; what type of alleles are present. Examples: TT, Tt, or tt

Review An organisms physical appearance is known as: Genotype Hybrid Genetics Phenotype

Homozygous vs. Heterozygous “homo” means the same Homozygous- both alleles are the same. (purebred) Examples: TT- homozygous dominant tt- homozygous recessive “hetero” means different Heterozygous- the alleles are different (hybrid) Examples: Tt- heterozygous

Homozygous or Heterozygous? Bb Heterozygous MM Homozygous dominant mm Homozygous recessive Mn

Review Another name for heterozygous is… Purebred Homozygous Hybrid Phenotype

Mouse Genetics

Punnett Squares A Punnett Square is a chart that shows all of the possible outcomes of a genetic cross The allele that each parent will pass on is based on chance

Punnett Square Practice Get out a piece of paper and let’s practice using a Punnett square.