Part I:
Questions:
1. Which of the following gives you the most information about an individual?
a. phenotype
b. genotype
2. Dominant alleles are represented by:
a. an upper case letter
b. a lower case letter
c. it does not matter what type of letter is used
3. In fruit flies, gray body color is dominant over black body color. Using the letter G to represent body color, what is the genotype of a heterozygous gray bodied fly?
a. GG
b. gg
c. Gg
d. GGgg
4. All of the offspring of two gray bodied flies are also gray. What can you conclude about the genotypes of the parent flies?
a. They are both heterozygous
b. They are both homozygous dominant
c. They are both homozygous recessive
d. You cannot conclude anything definitively about the parental genotypes
5. Some of the offspring of two gray bodied flies are black. What can you conclude about the genotypes of the parent flies?
a. They are both heterozygous
b. They are both homozygous dominant
c. They are both homozygous recessive
d. You cannot conclude anything definitively about the parental genotypes
6. Can the genotype for a gray-bodied fly be determined? Why or why not? Describe all of the possible genotypes for a fly with that phenotype.
7. Explain why an organism with a homozygous dominant genotype has the same phenotype as an organism with a heterozygous genotype.
8. What genetic information can be obtained from a Punnett square? What genetic information cannot be determined from a Punnett square?