WARM UP Describe 5 ways meiosis and/or fertilization could contribute to new traits, changing gene frequencies, natural selection, and evolution.

Patterns of Inheritance

(Gregor) Mendelian Genetics Two alleles for every trait –One passed on (segregation)

(Gregor) Mendelian Genetics Dominant allele is always expressed Traits don’t affect each other –Independent assortment

Punnett Squares Shows probabilities Monohybrid cross –Looks at one trait Dihybrid cross –Uses two traits

Punnett Squares Allow test crosses –Determine genotype of unknown parent Cross with a known recessive

Non-Mendelian Patterns Incomplete dominance –Heterozygotes are mixed Aa = pink

Non-Mendelian Patterns Codominance –Heterozygotes show both Aa = spotted

Non-Mendelian Patterns Multiple alleles –More than 2 gene varieties –4 genes for rabbits C=agouti C ch =chinchilla C h =himalayan c=albino C > C ch > C h > c

Human Blood Type A, B, O, or AB Multiple alleles –A, B, and O –A and B dominant O recessive Codominance –A and B alleles, AB blood type

WRAP UP 1.If you cross a yellow bean (bb) with a purple bean (BB), what % of the offspring will be purple? Use the Mendelian dominant/recessive relationship.

WARM UP 1.If you cross two Aa pink flowers (incomplete dominance), what percentage of the flowers will be white? Red? Pink?

WRAP UP 1.Do a Punnett square for a cross between a tall, purple flower (TtFf) with a short, white flower (ttff).

WARM UP Do a Punnett square for a cross between AB blood type and A blood type. –What is the genotype of the A blood parent? –What are the blood types of the offspring, and their percentages?

Human Blood Type A, B, O, or AB Multiple alleles –A, B, and O –A and B dominant O recessive Codominance –A and B alleles, AB blood type

WRAP UP For a person with Type O- blood, what antigens do they have on their blood cells? What antibodies do they have in their plasma? For a person with Type AB+ blood, what antigens do they have on their blood cells? What antibodies do they have in their plasma?

WARM UP Get your Blood Typing Materials ready at your desk.

WRAP UP Thoroughly clean your Blood Typing station and throw your materials in the appropriate waste container.