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1
An allele that is not expressed in a heterozygote is an example of a(n):
A)gene.
B)allele.
C)recessive trait.
D)dominant trait.
E)pure breeding type.
2
A mating between two related individuals is a:
A)monohybrid cross.
B)multihybrid cross.
C)pedigree.
D)consanguineous mating.
E)carrier.
3
The alleles present in an individual for a given trait constitute its:
A)phenotype.
B)genotype.
C)homozygote.
D)heterozygote.
E)recombinant type.
4
An individual with two different alleles for a given trait is known as a(n):
A)phenotype.
B)genotype.
C)homozygote.
D)heterozygote.
E)recombinant type.
5
The observable characteristic for a given trait is known as the:
A)phenotype.
B)genotype.
C)homozygote.
D)heterozygote.
E)recombinant type.
6
Pairs of alleles that separate during gamete formation illustrate the:
A)law of independent assortment.
B)law of the product.
C)law of the sum.
D)law of segregation.
E)Punnett square.
7
The probability of either of two mutually exclusive events occurring together is given by the:
A)law of independent assortment.
B)law of the product.
C)law of the sum.
D)law of segregation.
E)Punnett square.
8
Pairs of alleles that distribute randomly in gametes without regard to other pairs of alleles illustrate the:
A)law of independent assortment.
B)law of the product.
C)law of the sum.
D)law of segregation.
E)Punnett square.
9
A representation of phenotypic ratios of offspring is given by the:
A)independent assortment.
B)law of the product.
C)law of the sum.
D)law of segregation.
E)Punnett square.
10
The probability of two or more independent events occurring together is given by the:
A)law of independent assortment.
B)law of the product.
C)law of the sum.
D)law of segregation.
E)Punnett square.
11
In a cross of AABB x aabb, how frequent are heterozygotes at both gene pairs among the F2 offspring?
A)0
B)1/16
C)3/16
D)1/4
E)9/16
12
In some genetically engineered corn plants the dominant allele (BT) produces a protein that is lethal to certain flying insect pests that eat the corn plants. If the corn plant is heterozygous for BT and the farmer collects self-fertilized corn for next year's crop, what proportion of those plants would be toxic to insects?
A)All plants
B)1/4
C)1/3
D)1/2
E)3/4
13
If a woman and a man already have three boys, what is the probability that the next child will be a boy?
A)1
B)7/8
C)3/4
D)1/2
E)1/8
14
In a cross of AA x aa, at what frequency are heterozygotes found among the F2 offspring?
A)none
B)1/4
C)1/2
D)3/4
E)all
15
In a cross of AAbb x aaBB, how frequent is an AaBB individual in the F2 offspring?
A)0
B)1/16
C)1/8
D)1/4
E)1/8
16
If an individual has 7 gene pairs, how many different gametes can be formed if two of the gene pairs are homozygous and the remaining 5 gene pairs are heterozygous?
A)25
B)32
C)50
D)64
E)128
17
In the cross AaBb x aabb, how frequent are heterozygotes at both gene pairs among the F1 offspring?
A)all
B)9/16
C)1/2
D)5/16
E)1/4
18
Among the crosses below, which will give a 1:1 ratio of genotypes?
A)AABB x aabb
B)AaBb x AaBb
C)AaBb x aabb
D)AaBB x aaBB
E)AAbb x aaBB
19
Among the crosses below which will give a 1:1:1:1 ratio of genotypes in the F1?
A)AABB x aabb
B)AaBb x AaBb
C)AaBb x aabb
D)AaBB x aaBB
E)AAbb x aaBB
20
In a particular plant, hairy leaves (H) are dominant to smooth leaves (h) and vining growth habit (V) is dominant to bushy (v). A vining plant with hairy leaves of unknown genotype was crossed to a bushy plant with smooth leaves. The resulting progeny all had vining growth habit, but half had hairy leaves and half had smooth leaves. What was the genotype of the unknown parental vining plant with hairy leaves?
A)HHVV
B)hhVv
C)HHvv
D)HhVv
E)HhVV
21
True-breeding pea plants that have yellow, wrinkled seeds, yellow pods, and purple flowers were crossed with true-breeding pea plants that have green, smooth seeds, green pods, and white flowers. The resulting F1 progeny from that cross all have yellow, smooth seeds, green pods, and purple flowers. If the F1 from the cross above are crossed with true-breeding yellow, wrinkled seed, yellow pod, purple flower plants, what is the probability of observing an F2 plant with yellow, smooth seeds, yellow pods, and purple flowers?
A)0
B)1/16
C)1/8
D)1/4
E)1/2
22
A woman whose father was diagnosed with the dominant Huntington Disease (HD) marries a man whose family has no history of the disease. The woman does not know if she carries the trait and she is pregnant with the couple's first child. What is the probability that the child will develop HD?
A)0
B)1/16
C)1/4
D)1/2
E)1
23
Cystic fibrosis (CF) is a recessive trait that causes a fatal lung disorder, with symptoms beginning in early childhood. A healthy woman whose brother has CF marries a healthy man who has a sister with CF. What is the probability that their first child will have CF?
A)0
B)1/64
C)1/16
D)1/9
E)1/4
24
Cystic fibrosis (CF) is a recessive trait that causes a fatal lung disorder, with symptoms beginning in early childhood. A healthy woman whose brother has CF marries a healthy man who has a sister with CF. They have already had one child with CF. What is the probability that their second child will have CF?
A)0
B)1/64
C)1/16
D)1/9
E)1/4
25
A man and woman go to see a genetic counselor. They are concerned that they have a common ancestor, their great-grandmother, who they know was heterozygous for the recessive disease cystic fibrosis (CF). The counselor tells them the probability of their first child having CF is:
A)1/4
B)1/16
C)1/32
D)1/64
E)1/256





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