Question 1

An allele that appears more frequently in males is most likely

Accepted Answer

A) dominant. 
B) nonhomologous. 
C) autosomal. 
D) sex-linked. 
A) dominant. 
B) nonhomologous. 
C) autosomal. 
D) sex-linked.

Question 2

In humans, X-linked genetic diseases

Accepted Answer

A) are associated with autosomes. 
B) tend to be expressed more in females than males. 
C) only affect males. 
D) tend to be expressed more in males than in females. 
A) are associated with autosomes. 
B) tend to be expressed more in females than males. 
C) only affect males. 
D) tend to be expressed more in males than in females.

Question 3

Which of the following would explain two chromosomes in an individual cell that contain some, but not all, of the same genes at the same loci?

Accepted Answer

A) Both of the chromosomes are paternal. 
B) Both of the chromosomes are maternal. 
C) The chromosomes are from a common ancestor. 
D) A chromosomal alteration has occurred. 
A) Both of the chromosomes are paternal. 
B) Both of the chromosomes are maternal. 
C) The chromosomes are from a common ancestor. 
D) A chromosomal alteration has occurred.

Question 4

Match each correct statement to the set of alleles listed below.
-recessive homozygous for an autosomal gene

Accepted Answer

A) Bb 
B) XaY 
C) XAXa 
D) bb 
E) XAXA
F)BB
G)XAY 
A) Bb 
B) XaY 
C) XAXa 
D) bb 
E) XAXA
F)BB
G)XAY

Question 5

The gene for a certain sex-linked trait is found only on the Y chromosome. If the male parent carries this gene, which of the following statements about the inheritance of that trait is true?

Accepted Answer

A) The trait will be expressed in 100 percent of the female offspring. 
B) The trait will be expressed in 50 percent of the female offspring. 
C) The trait will be expressed in 100 percent of the male offspring. 
D) The trait will be expressed in 50 percent of the male offspring. 
A) The trait will be expressed in 100 percent of the female offspring. 
B) The trait will be expressed in 50 percent of the female offspring. 
C) The trait will be expressed in 100 percent of the male offspring. 
D) The trait will be expressed in 50 percent of the male offspring.

Question 6

What characteristics of inheritance would allow you to distinguish whether a disorder is recessive autosomal, dominant autosomal, or sex-linked?

Accepted Answer

Both recessive autosomal and sex-linked

Question 7

In humans, the "master sex switch" that determines whether an embryo will become a male is the

Accepted Answer

A) X chromosome. 
B) locus. 
C) SRY gene. 
D) androgen switch. 
A) X chromosome. 
B) locus. 
C) SRY gene. 
D) androgen switch.

Question 8

Two copies of the same gene on a single chromosome would indicate a(n) ________ had occurred.

Accepted Answer

A) deletion 
B) duplication 
C) inversion 
D) translocation 
A) deletion 
B) duplication 
C) inversion 
D) translocation

Question 9

Match each correct statement to the set of alleles listed below.
-female carrier of a sex-linked disease

Accepted Answer

A) Bb 
B) XaY 
C) XAXa 
D) bb 
E) XAXA
F)BB
G)XAY 
A) Bb 
B) XaY 
C) XAXa 
D) bb 
E) XAXA
F)BB
G)XAY

Question 10

Why are X-linked recessive genetic disorders more commonly seen in males?

Accepted Answer

A) For an X-linked disorder to occur, an individual must receive one allele only found on the X chromosome and a second allele found only on the Y chromosome, which females do not have. 
B) Females must receive two copies of the recessive allele to exhibit the disorder, but males need only one copy. 
C) The alleles of sex-linked genes are carried only on the Y chromosome, which females do not have. 
D) Females only have X chromosomes and genes on the X chromosome are not expressed. 
A) For an X-linked disorder to occur, an individual must receive one allele only found on the X chromosome and a second allele found only on the Y chromosome, which females do not have. 
B) Females must receive two copies of the recessive allele to exhibit the disorder, but males need only one copy. 
C) The alleles of sex-linked genes are carried only on the Y chromosome, which females do not have. 
D) Females only have X chromosomes and genes on the X chromosome are not expressed.

Question 11

Which of the following statements about homologous chromosomes is true?

Accepted Answer

A) There are 46 pairs in humans. 
B) They contain the same genes in the same locations. 
C) They contain identical alleles in the same location. 
D) They are also known as sex chromosomes. 
A) There are 46 pairs in humans. 
B) They contain the same genes in the same locations. 
C) They contain identical alleles in the same location. 
D) They are also known as sex chromosomes.

Question 12

A female who is a carrier of the sex-linked gene A has the genotype

Accepted Answer

A) Aa. 
B) AA. 
C) aa. 
D) XAXa. 
A) Aa. 
B) AA. 
C) aa. 
D) XAXa.

Question 13

Humans have ________ pairs of homologous chromosomes.

Accepted Answer

A) 46 
B) 23 
C) 22 
D) 44 
A) 46 
B) 23 
C) 22 
D) 44

Question 14

Autosomal dominant diseases are exhibited by anyone who carries at least one dominant allele for that gene. How is it that dominant lethal genes, such as the one that causes Huntington disease, can persist in a population?

Accepted Answer

A) The disease-causing allele can "hide" in the heterozygous condition. 
B) The disease develops only under the influence of other genes. 
C) These diseases usually take effect later in life after people have had children. 
D) The environment plays a large role in determining whether the gene is expressed. 
A) The disease-causing allele can "hide" in the heterozygous condition. 
B) The disease develops only under the influence of other genes. 
C) These diseases usually take effect later in life after people have had children. 
D) The environment plays a large role in determining whether the gene is expressed.

Question 15

Match each correct statement to the set of alleles listed below.
-heterozygous for an autosomal gene

Accepted Answer

A) Bb 
B) XaY 
C) XAXa 
D) bb 
E) XAXA
F)BB
G)XAY 
A) Bb 
B) XaY 
C) XAXa 
D) bb 
E) XAXA
F)BB
G)XAY

Question 16

A ________ is a chart that shows genetic relationships within a family over several generations.

Accepted Answer

A) karyotype 
B) pedigree 
C) Punnett square 
D) single-gene disorder map 
A) karyotype 
B) pedigree 
C) Punnett square 
D) single-gene disorder map

Question 17

An allele that "hides" in heterozygous carriers is called a ________ allele.

Accepted Answer

The answer of An allele that "hides" in heterozygous carriers...

Question 18

Would a karyotype for a human male be considered normal if it shows 45 autosomes and a single pair of sex chromosomes? Explain your reasoning.

Accepted Answer

A karyotype with 45 autosomes

Question 19

The genetic disorder followed through the pedigree shown is

Accepted Answer

A) recessive and X-linked. 
B) recessive and autosomal. 
C) dominant and X-linked. 
D) dominant and autosomal. 
A) recessive and X-linked. 
B) recessive and autosomal. 
C) dominant and X-linked. 
D) dominant and autosomal.

Question 20

Match each correct statement to the set of alleles listed below.
-dominant homozygous for an autosomal gene

Accepted Answer

A) Bb 
B) XaY 
C) XAXa 
D) bb 
E) XAXA
F)BB
G)XAY 
A) Bb 
B) XaY 
C) XAXa 
D) bb 
E) XAXA
F)BB
G)XAY

Exam 7: Chromosomes and Human Genetics

An allele that appears more frequently in males is most likely

In humans, X-linked genetic diseases

Which of the following would explain two chromosomes in an individual cell that contain some, but not all, of the same genes at the same loci?

Match each correct statement to the set of alleles listed below. -recessive homozygous for an autosomal gene

The gene for a certain sex-linked trait is found only on the Y chromosome. If the male parent carries this gene, which of the following statements about the inheritance of that trait is true?

What characteristics of inheritance would allow you to distinguish whether a disorder is recessive autosomal, dominant autosomal, or sex-linked?

In humans, the "master sex switch" that determines whether an embryo will become a male is the

Two copies of the same gene on a single chromosome would indicate a(n) ________ had occurred.

Match each correct statement to the set of alleles listed below. -female carrier of a sex-linked disease

Why are X-linked recessive genetic disorders more commonly seen in males?

Which of the following statements about homologous chromosomes is true?

A female who is a carrier of the sex-linked gene A has the genotype

Humans have ________ pairs of homologous chromosomes.

Autosomal dominant diseases are exhibited by anyone who carries at least one dominant allele for that gene. How is it that dominant lethal genes, such as the one that causes Huntington disease, can persist in a population?

Match each correct statement to the set of alleles listed below. -heterozygous for an autosomal gene

A ________ is a chart that shows genetic relationships within a family over several generations.

An allele that "hides" in heterozygous carriers is called a ________ allele.

Would a karyotype for a human male be considered normal if it shows 45 autosomes and a single pair of sex chromosomes? Explain your reasoning.

The genetic disorder followed through the pedigree shown is

Match each correct statement to the set of alleles listed below. -dominant homozygous for an autosomal gene

The Nature of Science

Chemistry of Life

Life Is Cellular

How Cells Work

Cell Division

Patterns of Inheritance

What Genes Are

How Genes Work

Evidence for Evolution

Mechanisms of Evolution

Adaptation and Species

The History of Life

Human Evolution

General Principles of Ecology

Growth of Populations

Communities of Organisms

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