Terms

Monohybrid Problems

1. Determine the F1 generation following a cross of a pure bred tall pea plant with a heterozygous tall pea plant. What is the probability of a dwarf pea plant? Use T and t.

Dihybrid Problems

1. Cross a tongue-rolling, non-PTC-tasting person (Rrtt) with a non-tongue-rolling heterozygous PTC-tasting person (??Tt) to get the F1 generation. What is the probability of a tongue-rolling, PTC-tasting offspring?

Co-Dominance Problems

1. What are the four main blood types and their possible genotypes? (recall the "dash" method for unknown genes).


2. Cross a type O person with a type AB person. What is the probability of getting a type B offspring?


3. Cross a type AB person with a type B person. What is the probability of getting a type B offspring (if - is O and if - is B)?


4. Hazel has type O blood and her baby has type O blood. She is trying to prove that her boyfriend, who has type A blood, is the father. Perform the cross and discuss.

Sex-Linkage Problems

1. Show using a proper cross and Punnett square that the probability that a couple will produce either a female or a male child is 50%.


2. Cross a hemophiliac man with a carrier female. What is the probability (of all offspring) that they will produce a hemophiliac son? Use X^H for normal blood gene and X^h for hemophilia gene.


3. Show using a proper cross and Punett square that if a normal male and a carrier female for ALD (the disorder in "Lorenzo's Oil") have children, a son (like "Lorenzo") inherits the disease from his mother.