1. Genetics Problems

2. Dominant/Recessive Type A Black fly is crossed with a gray fly to produce offspring of which 1/2 are black and 1/2 are gray. What are the genotypes of the parents?

3. In sesame plants, normal leaf is dominant to wrinkled leaf. Determine the genotypes for the two parents for following offspring: –318 normal, 98 wrinkled –400 normal –150 normal, 138 wrinkled –300 wrinkled

4. Codominant Type Problem A male parent with curly hair mates with a female parent with straight hair. Now, their daughter wants to know what the chances are that her kids will be afflicted with straight hair? She is married to a male with straight hair.

5. Dominant/Recessive Problem A man has six fingers on each hand and six toes on each foot. His wife and their daughter have normal number of digits. Extra digits is a dominant trait. What fraction of this couple's children would be expected to have extra digits?

6. Multiple Allele Problem A case was presented before a judge in Pennsylvania, in which a woman (Ricki) of blood type B (Ricki’s mom was type A & dad was type B), presented a baby (Bryan) of blood type O, claiming that Maury was the father. Maury has type A blood (Mom- type AB & Dad – type B). You are the judge. What is your decision and why?

7. Dominant/Recessive Oak Trees can have either a normal looking leaf or a very wide looking leaf. The wide leaf is actually the dominant trait. If a heterozygous Oak tree is crossed with a homozygous normal leaf tree, what is the chance that the tree will have wide leaves?

8. Multiple Allele Problem Victor, type AB blood, and Kate, type A blood, dated for 5 years then broke up. A year after they broke up, Victor found out that Kate had a child, Barney, type O blood. Victor takes Kate to court for custody of Barney. Kate claims Barney isn’t Victors. Is Barney Victor’s son? Explain

9. Darwin’s point is a recessive human trait where there is a point in the upper part of the ear. If a heterozygous person mates with a person with Darwin’s point, what is the chance that their kid will NOT have the point?

10. Fruit flies are born with wings. However, they may be born with really long wings or short wings. Actually, the short wings are the dominant trait. If a homozygous long winged fly is crossed with the heterozygous genotype, what is the chance that you end up with long winged flies?

11. Humans hairline is a fluctuating experience. Some people have normal hairlines and some have severely receding hairlines. However, normal blends with severely receding to show somewhat receding. If the male child of two people with severely receding hairlines, mates with a woman with no receding hairline, what is the chance that their kids having any sort of receding hairline?

12. Prince George has the genotype X N Y and does not have hemophilia. His wife, Princess Margarite is also normal. The Prince and Princess have had a son die at the age of 3 of hemophilia. –What is Princess Margarite's genotype? –What are the chances that their future children will have hemophilia? Prove with a square!

13. In corn plants a dominant allele is inherited for yellow kernel color. However, in the same field we see yellow kernel corn, brown kernel corn and white kernel corn. How could this be explained?

14. A man has six fingers on each hand and six toes on each foot. His wife and their daughter have normal number of digits. Extra digits is a dominant trait. What fraction of this couple's children would be expected to have extra digits?

15. Phenylketonuria (PKU) is an inherited disease caused by a recessive allele. If a woman and her husband are both carriers, what are the chances that at least one of their children will have PKU?

16. 1.Guinea Pigs come in two main colors, Black & Yellow. However, every once in awhile we see a speckled color Guinea Pig. We find out that Black & Yellow are codominant. If a black guinea pig and a speckled guinea pig are mated, what is the chance that you will end up with a yellow guinea pig? 2.Phenylketonuria (PKU) is an inherited disease caused by a recessive allele. If a woman and her husband are both carriers, what are the chances that at least one of their children will have PKU?