Have your homework out to be checked HAPPY THURSDAY  Have your homework out to be checked Bellwork: 1. On the left side of your notes from yesterday. Write down and work out the problem below. Label this “Incomplete Dominance” Crossing a black cat with a tan cat produces a tabby cat (combination of black and tan). This is an example of incomplete dominance. Cross a tan cat with a tabby cat, what are the phenotypes of the offspring? If you wanted all tabby cats, what color cats would you want to breed? B = Black Cat T= Tan Cat BT = Tabby Cat Mom = TT Dad = BT T T BT TT B T 50 % Tan Cats 50% Tabby Cats 0% Black Cats

Phenotypic Ratio = 0 Red: 2 Roan: 2 White Shoulder Partner 3. Predict the phenotypic ratios of offspring when a homozygous white cow is crossed with a roan bull. R = Red W = White RW = Roan Dad = RW Mom = WW R W RW WW W W Phenotypic Ratio = 0 Red: 2 Roan: 2 White

Non-Mendelian Genetics Practice Problems 1. Complete 2. Complete 3. Complete 1. 2. 3. 4. Incomplete Dominance/Codominance Blood Typing Problems Sex-Linked Problems

HW: Incomplete Dominance Homework check Let’s Grade

EQ: How do incomplete dominance and codominance compare ? Journals Page:_______ Title: Co-Dominance EQ: How do incomplete dominance and codominance compare ?

Standard B6F - Predict possible outcomes of genetic combinations such as Non-Mendelian Genetics.

Codominance: both alleles contribute to the phenotype equally (shared dominance) the heterozygous phenotype looks like an equal expression of both homozygous phenotypes.

Possible Blood Genotypes/Phenotypes AA = type A AO = type A BB = type B BO = type B AB = type AB OO = type O

Work these out on your sheet as we go  Practice Problems Work these out on your sheet as we go 

AA AB AO BO A B A O A = Type A B = Type B AB = Type AB O = Type O Shoulder Partner 1. If a man with blood type AB marries a woman heterozygous for type A, what is the probability that their child will be type B. A B A = Type A B = Type B AB = Type AB O = Type O Dad = AB Mom = AO AA AB AO BO A O 25 % chance of Type B

AB A- B- OO O B ? A O ? A = Type A B = Type B AB = Type AB O = Type O Shoulder Partner 2. A mother has type A blood and a father has type B blood. If their baby has type O blood, what is the genotype of the parents? O B ? A = Type A B = Type B AB = Type AB O = Type O Dad = BO or BB Mom = AO or AA AB A- B- OO A O ? Dad = BO Mom = AO

Phenotypes - 50% Type A: 50% Type B Independent 3. Use a Punnett square to show the possible genotypes and phenotypes for blood type of the offspring of two parents, one with blood type O and one with blood type AB. O O A = Type A B = Type B AB = Type AB O = Type O Dad = OO Mom = AB AO BO A B Genotypes - 50% AO: 50% BO Phenotypes - 50% Type A: 50% Type B

Jane – Type O Mary – Type A Whole Class 4. Two women gave birth to girls in the same hospital at the same time. The nurses think they may have accidentally switched the babies’ name tags and given the babies to the wrong parents. One baby, Jane, is type O. The other baby, Mary, is blood type A. The father in one set of parents, the Reds, is blood type A, and the mother is type B. The father in the other set of parents, the Greens, is blood type AB, and the mother is type O. Figure out which baby belongs to which parents. Show your work and reasoning. Reds Greens A B A - A = Type A B = Type B AB = Type AB O = Type O Red Dad = AA or AO Red Mom = BB or BO Green Dad = AB Green Mom = OO AO BO AB B- A- -- O B AO O AO - OO Jane – Type O Mary – Type A

Many genes have more than two alleles and are therefore said to have multiple alleles. This does not mean that an individual can have more than two alleles. It only means that more than two possible alleles exist in a population.

Traits controlled by two or more genes are said to be polygenic traits Traits controlled by two or more genes are said to be polygenic traits. Polygenic means “having many genes”.

Polygenic Inheritance Multiple genes control the inheritance of traits

The characteristics of organisms are not only determined by the genes it inherits. Characteristics are determined by interactions between genes and the environment.