Genetics Practice Problems1. Long hair (L) is dominant over short hair (l) in a particular breed of cat. Show thecross between a homozygous dominant long haired cat with a homozygous recessiveshort haired cat. What is the genotype and phenotype of the offspring?2. Show the cross between two offspring from the problem above. What are thegenotypic and phenotypic ratios of their offspring?3. Fill in the genotypes in the following pedigrees. Use the letter D for the firstpedigree, and A for the second pedigree.Recessive DisorderDominant Disorder4. In the pedigree below for the recessive disease cystic fibrosis, what is the chance thecouple in the middle will have a child with the disease?????5. Black rabbits (BB) are incompletely dominant over white rabbits (bb). Theheterozygote (Bb) is gray. Cross two gray rabbits and give the genotypic andphenotypic ratio of the offspring.6. A baby has type AB blood and the mother is type A. There are three potentialfathers, Dan who is type AB, Brad who is type A, and Don who is type O. Can thefather of the baby be determined (assuming there isn’t another possible father)? If so,who is the father?7. A type A baby is born to a type A mom. The potential father, who is type B, claimshe couldn’t have fathered the baby since he is type B. Is he correct?8. Hemophilia is an X-linked, recessive disease. If a woman who is normal (X HXh)marries a man with hemophilia (XhY), what percentage of their female children willbe expected to have the disease? What percentage of the male children? Whatpercentage of the females will be expected to be carriers?
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