Wize AP Biology Textbook > Mendelian Genetics
Probability Practice Problems
Practice: Probability of Sickle Cell Anemia
Sickle cell anemia is a recessive trait in humans. The gene that causes this disease is not located on the sex chromosomes. In a cross between a father who has sickle cell anemia and a mother who is heterozygous for the gene, what is the probability that their children will have the normal phenotype?
Practice: Probability of a Certain Genotype
A team of scientists are looking into 5 different genes (A, B, C, D, E) responsible for 5 different traits in a rare species of wild rabbits. In case they cross a rabbit that is heterozygous for all 5 genes with another rabbit that has an identical genotype, what is the probability of having an offspring with the following genotype: AABbCCddEe
Practice: Cystic Fibrosis Phenotype Probability
Cystic fibrosis is a recessive trait in humans. The gene that causes this disease is not located on the sex chromosomes. In a cross between a father who has cystic fibrosis and a mother who is heterozygous for the gene, what is the probability that their first three children will have the abnormal phenotype?