Phenylketonuria is an inherited disease caused by a recessive autosomal allele. If a woman and her husband are both carriers, what is the probability that their first child will be a phenotypically normal girl?

1
Phenylketonuria is an inherited disease caused by
a recessive autosomal allele. If a woman and her
husband are both carriers, what is the
probability that their first child will be a
phenotypically normal girl?

1. 1/4
2. 1/16
3. 1.0
4. 3/16
5. 3/8

2
Phenylketonuria is an inherited disease caused by
a recessive autosomal allele. If a woman and her
husband are both carriers, what is the
probability that their first child will be a
phenotypically normal girl?

1. 1/4
2. 1/16
3. 1.0
4. 3/16
5. 3/8 -- 3/4 healthy x 1/2 girl.

3
Assuming independent assortment for all gene
pairs, what is the probability that the following
parents, AABbCc ? AaBbCc, will produce an AaBbCc
offspring?

1. 1/2
2. 1/16
3. 1/8
4. 3/4
5. 9/16

4
Assuming independent assortment for all gene
pairs, what is the probability that the following
parents, AABbCc ? AaBbCc, will produce an AaBbCc
offspring?

1. 1/2
2. 1/16
3. 1/8
4. 3/4
5. 9/16

5
A sexually reproducing organism is heterozygous
for two genes located on different chromosomes,
one for ear shape and one for toe length. Its
genotype is AaBb. Which of the following
genotypes is most probable in a gamete from this
organism?

1. AB
2. AaBb
3. Aa
4. Bb
5. A

6
A sexually reproducing organism is heterozygous
for two genes located on different chromosomes,
one for ear shape and one for toe length. Its
genotype is AaBb. Which of the following
genotypes is most probable in a gamete from this
organism?

1. AB
2. AaBb
3. Aa
4. Bb
5. A

7
Pseudohypertrophic muscular dystrophy is a human
disorder that causes gradual deterioration of the
muscles. It is seen only in boys born to
apparently normal parents and usually results in
death in the early teens. It is likely that this
gene is ______ and ______.

1. recessive sex-linked
2. dominant sex-linked
3. recessive autosomal (not sex-linked)
4. codominant sex-linked
5. incompletely dominant autosomal (not sex-linked)

8
Pseudohypertrophic muscular dystrophy is a human
disorder that causes gradual deterioration of the
muscles. It is seen only in boys born to
apparently normal parents and usually results in
death in the early teens. It is likely that this
gene is ______ and ______.

1. recessive sex-linked
2. dominant sex-linked
3. recessive autosomal (not sex-linked)
4. codominant sex-linked
5. incompletely dominant autosomal (not sex-linked)

9
Whenever either or both gene A or gene B is
present, red color is produced. A cross of AaBb ?
AaBb would be expected to yield how many red
offspring out of 16? Assume the genes are not
linked.

1. 1
2. 4
3. 12
4. 15
5. 16

10
Whenever either or both allele A or allele B is
present, red color is produced. A cross of AaBb ?
AaBb would be expected to yield how many red
offspring out of 16? Assume the genes are not
linked.

1. 1
2. 4
3. 12
4. 15
5. 16