1. What does it mean when a trait is dominant?
2. What does it mean when a trait is recessive?
Write answers on a separate sh
& submit together
3. In the Punnett square T=tall and t = short. What is the genotype of the
parents?
4. What is the phenotype of the parents?
5. What are the genotypes and phenotypes of the offspring?
T
T
TT
Tt
6. What is the genotypic ratio of the offspring?
7. What is the phenotypic ratio of the offspring?
t
Tt
It
8. What environmental factors might affect the expression of these genes for
height?
9. What does it mean if a trait is codominant?
10. Some genes experience incomplete dominance. Cross a pure breeding red flower (RR) with a pure
breeding white flower (WW). Give the genotypes and phenotypes of the offspring.
11. If a woman with Type A blood has a child with a man with Type B blood and their first child has Type
O blood, give the genotype of the woman and the man and do the cross. (Alleles are I, I, and i)
12. What are the odds that they will have a child with Type O blood again?
13. What are the odds that they will have a child with homozygous Type A?
14. What are the odds that they will have a child with Type AB?
15. A blood test is done to see if one of three men is the father of a child. The child has type O blood, the
mother has type A blood. Man #1 has type AB blood, Man #2 has type A blood, Man #3 has type O
blood. Are there any men that can be ruled out as the father? Explain.
16. What does it mean to have multiple alleles?
17. What does polygenic traits mean?
18. What are the sex chromosomes in males?
Females?
19. Colorblindness & hemophilia are sex-linked traits. What chromosome location (#) are these genes
found?
20. Cross a female who is a carrier for hemophilia with a normal male.
21. What are the odds that they will have a child with hemophilia?
22. What are the odds that they will have a daughter with hemophilia?
23. What are the odds that they will have a daughter who is a carrier for hemophilia?
24. Why are males more likely to show this type of disorder? (Who (mother/father) is likely to give them
the bad gene?)