Download Practice Problems – White Board Practice Monohybrid Crosses 1. A

Practice Problems – White Board Practice
Monohybrid Crosses
1. A solid coat is dominant over a spotted coat in dogs. Cross a homozygous solid dog with a
homozygous spotted dog. What are the genotype and phenotype ratios?
2. In humans, webbed toes are dominant over separated toes. A heterozygous man with webbed toes
marries a woman with normal separated toes. What is the chance that their children will have webbed
toes?
Incomplete Dominant Crosses
1. In people curly hair is incompletely dominant over straight hair. A heterozygous male reproduces with
a straight haired woman. What are the genotype and phenotype percents?
2. In rats, black rats are incompletely dominant to white rats. Cross a black rat with a white rat. What
are the genotype and phenotype percents?
Codominance
1. In cows, black is codominant to white. Cross a black cow with a heterozygous cow. What are the
genotype and phenotype ratios?
2. Cross a heterozygous male with type A Blood, with a female with type O Blood. What are the possible
blood types of the children?
3. Cross a homozygous male with type B blood with a type AB blood. What are the possible blood type of
the children?
Sex-linked Cross
1. A normal man marries a woman that is a carrier for hemophilia. What percent chance will they have
sons with hemophilia? Daughters?
2. Cross a normal female that is not a carrier for hemophilia with a man that has hemophilia. What
percent chance will they have sons with hemophilia? Daughters?