Chapter 11 Genetics Quiz
Name:
1. Differentiate between phenotype and genotype. Give examples of each.
2. Write a heterozygous genotype.
3. Write a homozygous genotype.
4. Differentiate between dominant and recessive alleles.
5. Given the following genotypes indicate the appropriate phenotype.
A= Round seed
a= wrinkled seed
T= Tall
t = short
R = red flowers
r= white
a) AA_________________________
d) Tt___________________________
b) aa__________________________
e) Rr__________________________
c) rr___________________________
6. There are some exceptions to the standard rule of Dominance; such as Codominance and Incomplete dominance.
Differentiate between Codominance and Incomplete dominance.
Follow these 5 steps for a perfect Punnett Square
a) write the genotype of the parents
b) write out all the possible gametes
c) perform the cross
d) write out the genotypic ratios
e) write out the phenotypic ratios
7. How is sex determined in humans? Perform a cross through a Punnett Square to help your explanation. Use the 5
steps! (Females have XX chromosomes, Males have XY)
8. In pea plants, Green seed color is dominant to yellow seed color. Cross two plants that are both heterozygous for seed
color. Use the 5 steps!!!!!
9. In pea plants, Tall is dominant to short. Cross a homozygous tall plant with a homozygous short plant. Use the 5 steps!
10. In horses, Brown hair (B) is dominant to black hair (b). Also, Long tails (T) are dominant to short tails (t). Perform a
cross between a horse who is heterozygous for both traits with a horse who is also heterozygous for both traits. Use the
steps, but you DO NOT have to include the genotypic ratio. You must include the phenotypic ratio.
11. In horses, Brown hair (B) is dominant to black hair (b). Also, Long tails (T) are dominant to short tails (t). Cross a horse
who is homozygous for Brown hair and heterozygous for long tail with a horse who is heterozygous for both traits. Use
the steps but you DO NOT have to include the genotypic ratio. You must include the phenotypic ratio.
Extra Credit:
1. Who is the ‘Father of Genetics’? (1 point)
2. What is the law of segregation? (2 points)
3. Is human blood type an example of codominance or incomplete dominance? (1 point)
4. What are the possible alleles for blood type? (There are three) (1 point)
5. Codominance and incomplete dominance are exceptions to the standard rule of Dominance. What is a third
exception to the rule discussed in class? ( 1point)