15 Jun Genetics Practice Problems – Long hair (L) is dominant over short hair (l) in a particular breed of cat
Question
Genetics Practice Problems
1. Long hair (L) is dominant over short hair (l) in a particular breed of cat. Show the
cross between a homozygous dominant long haired cat with a homozygous recessive
short haired cat. What is the genotype and phenotype of the offspring?
2. Show the cross between two offspring from the problem above. What are the
genotypic and phenotypic ratios of their offspring?
3. Fill in the genotypes in the following pedigrees. Use the letter D for the first
pedigree, and A for the second pedigree.
Recessive Disorder
Dominant Disorder
4. In the pedigree below for the recessive disease cystic fibrosis, what is the chance the
couple in the middle will have a child with the disease?
????
5. Black rabbits (BB) are incompletely dominant over white rabbits (bb). The
heterozygote (Bb) is gray. Cross two gray rabbits and give the genotypic and
phenotypic ratio of the offspring.
6. A baby has type AB blood and the mother is type A. There are three potential
fathers, Dan who is type AB, Brad who is type A, and Don who is type O. Can the
father 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, claims
he 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 will
be expected to have the disease? What percentage of the male children? What
percentage of the females will be expected to be carriers?
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