Download Unit 2 Review File

Unit 2 Review
1. If a trait is inherited in an autosomal recessive fashion, which
of the following is not true?
a. Inbreeding may be present.
b. The trait often appears in the children of unaffected parents.
c. Two affected individuals can have an unaffected child.
d. About 1/4 of the members of a pedigree will be affected.
e. Both sexes are equally affected.
2. A carrier of a particular disease gene usually:
a. suffers milder forms of the symptoms.
b. is considered normal.
c. suffers as much from the symptoms as the person who has
the disease.
d. usually has no health problems from this particular disease.
e. suffers only from certain symptoms.
3. The probability that a child in a particular family will inherit
a recessive disorder is 1/4. If the parents have four
children, what is the probability that their third child
will inherit the disorder?
a. 1/64
b. 0
c. 1/4
d. 1/2
e. 3/4
4. What is the probability that parents with genotypes Aa and
Aa will produce four consecutive aa children?
a. 1/64
b. 1/256
c. 1/4
d. 1/16
e. 1/502
5. Independent assortment means that:
a. monohybrid crosses will show segregation and independent
assortment.
b. there is a random distribution of genes into gametes.
c. the phenotypic ratio in the F2 will be the same for dihybrid
and monohybrid crosses.
d. the segregation of one gene pair depends on the segregation
of another gene pair.
e. the gametes produced must be heterozygous in all cases.
6. In autosomal dominant inheritance:
a. two affected individuals may have unaffected children.
b. the trait often skips generations.
c. a damaging phenotype is also produced.
d. males are more affected than females.
e. about 1/4 of the offspring in a pedigree will show the trait.
7. Using the product rule, predict the probability that parents
heterozygous for two traits (AaBb) produce a
homozygous recessive offspring (aabb).
a. 1/24
b. 1/4
c. 1/64
d. 1/16
e. 1/8
8. If both parents have the genotype SsYy, what proportion of
the offspring will have the same genotype as the
parents?
a. 1/16
b. 4/16
c. 3/16
d. 9/16
e. 2/16
9. If the parental genotypes are AaBbCc x AabbCc, what is the
probability that the offspring would be AaBbCc?
a. 1/32
b. 1/64
c. 1/4
d. 1/16
e. 1/8
10. An individual has the genotype AaBbCcDdEE. How many
types of different gametes can this individual produce?
a. 4
Answers
1. C
2. A
3. C
4. B
5. B
6. A
7. D
8. B
9. E
10. C
b. 8
c. 16
d. 32
e. 64