Question 1

Ichthyosis is a recessive sex-linked disorder that causes a person's skin to flake off like fish scales. A normal man and a normal woman produce a child with ichthyosis. This child cannot be female.

Accepted Answer

A) True 
 B)False

Question 2

An XX individual develops as a male. Which of the following statements offers the most likely explanation?

Accepted Answer

A)  This is the usual situation for an XX individual.
B)  This occurs when the sperm does not contribute any genetic material.
C)  A piece of a Y chromosome has become attached to one of the X chromosomes.
D)  This occurs when the egg does not contribute any genetic material.

Question 3

During translocation,

Accepted Answer

A)  pieces of DNA are exchanged between the non-sister chromatids of a homologous pair.
B)  a segment of DNA is broken off of a chromosome and reattached to the same chromosome, but backward in orientation.
C)  segments of DNA involved in crossing-over undergo somatic mutations.
D)  a segment of DNA breaks off one chromosome and is attached to a nonhomologous chromosome.

Question 4

The farther apart on the same chromosome that two genes are located, the more likely they are to undergo ____________________.

Accepted Answer

recombinat...

Question 5

This chromosomal disorder known as Cri du chat syndrome is the result of missing a part of chromosome 5, an example of chromosome

Accepted Answer

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

Question 6

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

Accepted Answer

The answer of A female who is a carrier of...

Question 7

Two chromosomes that have the same set of genes, but perhaps different versions of those genes, are called ____________________ chromosomes.

Accepted Answer

The answer of Two chromosomes that have the same set...

Question 8

Which of the following statements is not true with regard to Huntington's disease?

Accepted Answer

A)  The discovery of the gene has led to a test that can identify people who will have the disease before they show symptoms.
B)  The disease can be traced using pedigrees.
C)  Now that the gene is known, a cure has been found.
D)  The gene for Huntington's disease is located on chromosome 4.

Question 9

One chromosomal abnormality that is usually fatal is

Accepted Answer

A)  a mutation in a gene on the chromosome.
B)  the exchange of material between homologous chromosomes.
C)  a change in the number of sex chromosomes.
D)  the addition of an extra autosomal chromosome.

Question 10

The ____________________ gene is responsible for activating many genes involved in "maleness" during embryonic development.

Accepted Answer

The answer of The ____________________ gene is responsible for activating...

Question 11

Inheritance is said to be both stable and variable because

Accepted Answer

A)  chromosome structure ensures that the DNA sequence of a chromosome never changes, but allows offspring to inherit individual chromosomes randomly.
B)  the process of gamete formation never changes, but the number of chromosomes in a gamete differs in different offspring.
C)  most of the time, genetic material is transferred with complete accuracy to the next generation while still creating unique individuals.
D)  each new individual is a mixture of different chromosomes, but the same genes are found on every chromosome in that individual.

Question 12

If a genetic disorder is caused by a dominant allele, individuals with which of the following genotypes would be affected by the disorder?

Accepted Answer

A)  AA and aa
B)  aa and Aa
C)  AA and Aa
D)  AA, Aa, and aa

Question 13

In humans, which of the following chromosomes would probably carry the fewest genes?

Accepted Answer

A)  the Y chromosome
B)  chromosome 4
C)  the X chromosome
D)  chromosome 14

Question 14

Lethal ____________________ mutations are not eliminated from a population because they can be "hidden" in symptom-free individuals also carrying dominant alleles.

Accepted Answer

The answer of Lethal ____________________ mutations are not eliminated from...

Question 15

The tendency to develop diseases, such as cancer and heart disease, is

Accepted Answer

A)  usually the result of a mutation in one gene.
B)  the result of new combinations of alleles formed during meiosis.
C)  the result of the interaction of multiple genes and environmental factors.
D)  the result of multiple mutations caused by crossing-over.

Question 16

A ____________________ is an individual with a heterozygous genotype who does not express the recessive trait but can pass it along to offspring.

Accepted Answer

The answer of A ____________________ is an individual with a...

Question 17

Which of the following combinations of sex chromosomes would most probably have the most serious effects?

Accepted Answer

A)  XXXX
B)  XXY
C)  X
D)  XX

Question 18

Some of the F₂ gametes involved in the cross below formed as a result of crossing-over.

Accepted Answer

A) True 
 B)False

Question 19

Scientists are able to determine what alleles are present in your DNA because every gene in a human occupies a specific position or ____________________ in your chromosomes.

Accepted Answer

The answer of Scientists are able to determine what alleles...

Question 20

All sex-linked genes are either X-linked or _-linked.

Accepted Answer

The answer of All sex-linked genes are either X-linked or...

Exam 13: Chromosomes and Human Genetics

The farther apart on the same chromosome that two genes are located, the more likely they are to undergo ____________________.

Correct Answerverifiedrecombinat...View AnswerShow Answer

Inheritance is said to be both stable and variable because

Correct AnswerverifiedShow Answer

The tendency to develop diseases, such as cancer and heart disease, is

Correct AnswerverifiedShow Answer

All sex-linked genes are either X-linked or _-linked.

Correct AnswerverifiedShow Answer

The ____________________ gene is responsible for activating many genes involved in "maleness" during embryonic development.

Correct AnswerverifiedShow Answer

Which of the following statements is not true with regard to Huntington's disease?

Correct AnswerverifiedShow Answer

In humans, which of the following chromosomes would probably carry the fewest genes?

Correct AnswerverifiedShow Answer

Two chromosomes that have the same set of genes, but perhaps different versions of those genes, are called ____________________ chromosomes.

Correct AnswerverifiedShow Answer

Ichthyosis is a recessive sex-linked disorder that causes a person's skin to flake off like fish scales. A normal man and a normal woman produce a child with ichthyosis. This child cannot be female.

Correct AnswerverifiedShow Answer

During translocation,

Correct AnswerverifiedShow Answer

Which of the following combinations of sex chromosomes would most probably have the most serious effects?

Correct AnswerverifiedShow Answer

If a genetic disorder is caused by a dominant allele, individuals with which of the following genotypes would be affected by the disorder?

Correct AnswerverifiedShow Answer

One chromosomal abnormality that is usually fatal is

Correct AnswerverifiedShow Answer

Lethal ____________________ mutations are not eliminated from a population because they can be "hidden" in symptom-free individuals also carrying dominant alleles.

Correct AnswerverifiedShow Answer

Some of the F₂ gametes involved in the cross below formed as a result of crossing-over.

Correct AnswerverifiedShow Answer

Scientists are able to determine what alleles are present in your DNA because every gene in a human occupies a specific position or ____________________ in your chromosomes.

Correct AnswerverifiedShow Answer

This chromosomal disorder known as Cri du chat syndrome is the result of missing a part of chromosome 5, an example of chromosome

Correct AnswerverifiedShow Answer

A ____________________ is an individual with a heterozygous genotype who does not express the recessive trait but can pass it along to offspring.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

An XX individual develops as a male. Which of the following statements offers the most likely explanation?

Correct AnswerverifiedShow Answer

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