In a certain population of African people, 9% of the population is born with sickle cell anemia. This is a recessive disease. What % of the population is: Homozygous Dominant? Heterozygous?

What percent of offspring will be homozygous recessive if the genotypic ratio is 4:0:0.  (For your answer write the number and the percent sign, example:  32%)

Parents often want to know what is genetically possible for their children. If two parents are carriers for a recessive lethal trait, what are the odds that their child is also a carrier? Many times there is interest in tracking multiple traits at once (not just 1 or 2). The same probability rules apply here, you just multiple all the odds together at once. Imagine two parents. They are both carriers for red hair, one person is blood type AB, the other is type O. They want to know the odds of a daughter with red hair and type B blood. Please do no not do a giant Punnett square! Use probability or individual squares. a. What are the genotypes of the parents? b. What are the odds of each trait (daughter, red hair, type B)

Mendelian Genetics Worksheet Name Hour Fill in the Punnett squares for each cross given to determine the phenotype and genotype ratio's of the offspring Crosses with one homozygous dominant parent: AA x AA A AA x Aa A АА х а A AA x aa A A A A A a A a a Offspring Genotypes: AA AA AA Aa Offspring Phenotypes: Aa Aa aa aa aa Dominant Dominant Recessive Dominant Recessive Recessive_ _ Crosses with one heterozygous parent: Aа х АА Аа х Аа Аа х аа A a A a A a A a A a a Offspring Genotypes: AA_ Aa_ aa AA Aa aa AA_ Aa aa Offspring Phenotypes: Dominant Recessive Dominant Dominant Recessive Recessive _ Crosses with one homozygous recessive parent: aa x AA aa x Aa аа х аа a a a a a a A A a A a a Offspring Genotypes: AA Aa_aa AALAA_aa AA Aa_ aa_ Offspring Phenotypes: Dominant Dominant Dominant Recessive_ Recessive_ Recessive _