1. The chemical factors that determine traits are called __________.
a. alleles
b. traits
c. genes
d. characters
2. The term phenotype refers to the ___________ of an individual.
a. breeding pattern
b. number of chromosomes
c. genetic constitution
d. appearance of a characteristic or trait
3. Organisms that have two identical alleles for a particular trait are said to be
a. hybrid.
b. homozygous.
c. heterozygous.
d. dominant.
4. A cross of a red cow (RR) with a white bull (WW) produces all roan offspring (RW). This type of inheritance is known as
a. incomplete dominance.
b. polygenic inheritance
c. codominance.
d. multiple alleles.
5. Pink four o'clock flowers are obtained from a cross between pure breed red flower plant and pure white flower plant. What is the genotype of the pink flower?
a. RR
b. RW
c. WW
d. Rr
6. A pink flower is crossed with another pink flower. The genotype of pink flower is RW. How many percent of offspring is pure white?
a. 0%
b. 25%
c. 50%
d. 100%
7. Based from the problem in no. 6, how many percent of offspring is pink?
a. 0%
b. 25%
c. 50%
d. 100%
8. A pure red cow has a genotype of RR and roan cow has a genotype of RW. A roan cow and red cow are mated. What is the phenotype ratio of offspring?
a. 1 red: 2 roan: 1 white
b. 1red: 1 roan
c. 1 red: 2 roan
d. 2 red: 1 roan
9. How many percent of offspring is red in problem no. 8?
a. 0%
b. 25%
c. 50%
d. 100%
10. How many percent of offspring is heterozygous in problem no. 8?
a. 0%
b. 25%
c. 50%
d. 100%
11. Human blood types are produced by alleles A, B, O. Having more than 2 alleles control a trait is called
a. incomplete dominance
b. codominance
c. polygenic traits
d. multiple alleles
12. In determining the phenotype for the ABO blood system:
a. O is dominant over A
b. B is dominant over A
c. O is recessive
d. all of the above
13. Traits that are expressed in both sexes but more frequently in one than in the other sex is called
a. Sex-linked traits.
b. Sex-limited traits.
c. Sex-influenced traits.
d. Multiple alleles
14. Which of the following is an example of sex-linked traits?
a. color-blindness
b. lactation in cattle
c. baldness
d. all of the above
15. If one of your parents is blood type A and the other is type B, which of the following blood types would you likely be?
a. A
b. B
c. O or AB
d. any of the blood type above
16. Carriers of color-blindness trait include
a. men who are heterozygous for the trait.
b. men who are homozygous for the trait,
c. women who are heterozygous for the trait.
d. women who are homozygous for the trait.
17. A child is born with the blood type B. The mother of the child is blood type O. Which of the following statements is most correct?
a. The father must be blood type B.
b. The father could be blood type AB.
c. The father passed along a recessive allele.
d, The mother could have passed along a type B allele.
18. A color blind man marries a woman who is a carrier of the trait? How many percent of their children will be color-blind?
a. 0%
b. 25%
c. 50%
d. 100%
19. Based from the problem in 18 , what is the chance that a daughter will be color-blind?
a. 0%
b. 25%
c. 50%
d. 100%
20. What is the name of inheritance pattern in which both alleles are expressed equally?
a. Incomplete dominance
b. Codominance
c. Multiple alleles
d. blood type
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