Download Practice Chapter 15

Practice Chapter 15
Name___________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) People who have red hair usually have freckles. This can best be explained by
A) reciprocal translocation.
B) linkage.
C) independent assortment.
D) nondisjunction.
E) sex-influenced inheritance.
2) Vermilion eyes is a sex-linked recessive characteristic in fruit flies. If a female having vermilion eyes is
crossed with a wild-type male, what percentage of the F1 males will have vermilion eyes?
A) 25%
B) 0%
C) 50%
D) 100%
E) 75%
3) New combinations of linked genes are due to
A) independent assortment.
B) nondisjunction.
C) environmental changes such as temperature extremes.
D) crossing over.
E) mixing of sperm and egg.
4) The reason that linked genes are inherited together is
A) that the number of genes in a cell is greater than the number of chromosomes.
B) that chromosomes are unbreakable.
C) due to gene alignment during metaphase I.
D) that they are located on the same chromosome.
E) tha alleles are paired.
5) A man who carries an X-linked allele will pass it on to
A) half of his daughters.
B) all of his sons.
C) half of his sons.
D) all of his daughters.
E) all of his children.
Refer to the following information to answer the questions below. An achondroplastic dwarf man with normal vision marries a
color-blind woman of normal height. The man's father was six feet tall, and both the woman's parents were of average height.
Achondroplastic dwarfism is autosomal dominant, and red-green color blindness is X-linked recessive.
6) How many of their female children might be expected to be color-blind dwarfs?
A) half
B) three out of four
C) one out of four
D) none
E) all
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7) A Barr body is normally found in the nucleus of which kind of human cell?
A) sperm cells only
B) somatic cells of a female only
C) both male and female somatic cells
D) somatic cells of a male only
E) unfertilized egg cells only
8) In cats, black color is caused by an X-linked allele; the other allele at this locus causes orange color. The
heterozygote is tortoiseshell. What kinds of offspring would you expect from the cross of a black female and
an orange male?
A) orange female; black male
B) tortoiseshell female; tortoiseshell male
C) orange female; orange male
D) tortoiseshell female; black male
E) black female; orange male
9) Red-green color blindness is a sex-linked recessive trait in humans. Two people with normal color vision
have a color-blind son. What are the genotypes of the parents?
A) XCXc and XCY
B) XCXC and XcY
C) XCXC and XCY
D) XcXc and XCY
E) XcXc and XcY
10) If a chromosome lacks certain genes, what has most likely occurred?
A) disjunction
B) a translocation
C) an inversion
D) a nonduplication
E) a deletion
11) Fragile X syndrome is more common in males than in females. One explanation for this is
A) genomic imprinting by the mother.
B) the age of the mother.
C) sex-linked inheritance.
D) Only A and C are correct.
E) A, B, and C are correct.
12) What do all human males inherit from their mother?
A) an X chromosome
B) mitochondrial DNA
C) the gene for normal gonad development (SRY)
D) A and B
E) A, B, and C
13) A tetraploid individual has __________ sets of chromosomes.
A) 1
B) 2
C) 3
2
D) 4
E) 5
Answer Key
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