Question 1

Why are dominant genetic disorders more rare than recessive disorders?

Accepted Answer

Dominant genetic disorders tend to cause

Question 2

Does the pedigree shown most likely represent a condition that is autosomal recessive,dominant,or sex-linked? Explain your reasoning.

Accepted Answer

The pedigree shows a disorder that is mo

Question 3

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 4

The parents in the figure shown are carriers of a genetic disorder.Based on the Punnett square,the allele that causes the disorder must be

Accepted Answer

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

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

If a recessive allele causes a fatal disease that kills the affected individual before he or she can reproduce,why doesn't that allele quickly become extinct in the population?

Accepted Answer

A) Alleles are never lost from a population. 
B) The homozygous dominant individuals protect the recessive allele in their genomes. 
C) The recessive allele is carried in the genome of heterozygotes,who do not suffer from the disease. 
D) The homozygous recessive individuals give their alleles to other individuals before they die from the disease. 
A) Alleles are never lost from a population. 
B) The homozygous dominant individuals protect the recessive allele in their genomes. 
C) The recessive allele is carried in the genome of heterozygotes,who do not suffer from the disease. 
D) The homozygous recessive individuals give their alleles to other individuals before they die from the disease.

Question 7

The X chromosome in humans is

Accepted Answer

A) found as a pair in females. 
B) the only human sex chromosome. 
C) present only in females. 
D) always found in single copy. 
A) found as a pair in females. 
B) the only human sex chromosome. 
C) present only in females. 
D) always found in single copy.

Question 8

Human males have one chromosome that females do not,known as the ________ chromosome.

Accepted Answer

The answer of Human males have one chromosome that females...

Question 9

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 10

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 11

If a father is affected by an X-linked condition and the mother is a carrier,what is the probability of their children being affected?

Accepted Answer

A) All sons will be affected. 
B) Half of the sons will be affected. 
C) All daughters will be affected. 
D) Half of the sons will be carriers. 
A) All sons will be affected. 
B) Half of the sons will be affected. 
C) All daughters will be affected. 
D) Half of the sons will be carriers.

Question 12

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

Accepted Answer

A) homozygous 
B) heterozygous 
C) recessive 
D) dominant 
A) homozygous 
B) heterozygous 
C) recessive 
D) dominant

Question 13

Among children with parents who are both carriers of Tay-Sachs,an autosomal recessive disorder,chances are that

Accepted Answer

A) 75 percent will be carriers. 
B) 50 percent will die in a few years. 
C) 75 percent will not carry the recessive Tay-Sachs's allele. 
D) 50 percent will be carriers. 
A) 75 percent will be carriers. 
B) 50 percent will die in a few years. 
C) 75 percent will not carry the recessive Tay-Sachs's allele. 
D) 50 percent will be carriers.

Question 14

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 15

A karyotype from an adult male indicates a chromosomal abnormality,which does not affect his health.Which of the following abnormalities is most likely seen?

Accepted Answer

A) three copies of the X chromosome 
B) no copies of chromosome 2 
C) a translocation between chromosome 14 and chromosome 15 
D) a deletion on chromosome 5 
A) three copies of the X chromosome 
B) no copies of chromosome 2 
C) a translocation between chromosome 14 and chromosome 15 
D) a deletion on chromosome 5

Question 16

What information is NOT visible in a karyotype?

Accepted Answer

A) the individual's sex 
B) the number of autosomes 
C) whether the individual carries genetic mutations 
D) whether deletions have occurred 
A) the individual's sex 
B) the number of autosomes 
C) whether the individual carries genetic mutations 
D) whether deletions have occurred

Question 17

In the pedigree shown,the individual indicated represents a(n)

Accepted Answer

A) healthy male. 
B) healthy female. 
C) affected male. 
D) affected female. 
A) healthy male. 
B) healthy female. 
C) affected male. 
D) affected female.

Question 18

A person is genetically XX and develops as a male.How can this be explained?

Accepted Answer

A) In humans,males are XX. 
B) An error in karyotyping this individual must have occurred because XX individuals cannot develop into a male. 
C) A piece of a Y chromosome has become attached to one of the X chromosomes. 
D) The SRY gene was deleted in this individual. 
A) In humans,males are XX. 
B) An error in karyotyping this individual must have occurred because XX individuals cannot develop into a male. 
C) A piece of a Y chromosome has become attached to one of the X chromosomes. 
D) The SRY gene was deleted in this individual.

Question 19

Which of the following statements would indicate a pedigree that shows the inheritance pattern of a recessive X-linked disease?

Accepted Answer

A) Most affected individuals are females. 
B) Most affected individuals are males. 
C) Males and females are affected equally. 
D) The disease is seen in every generation. 
A) Most affected individuals are females. 
B) Most affected individuals are males. 
C) Males and females are affected equally. 
D) The disease is seen in every generation.

Question 20

Except for the sex chromosomes,all the chromosomes shown in a karyotype are numbered and are called ________.

Accepted Answer

The answer of Except for the sex chromosomes,all the chromosomes...

Why are dominant genetic disorders more rare than recessive disorders?

Does the pedigree shown most likely represent a condition that is autosomal recessive,dominant,or sex-linked? Explain your reasoning.

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 parents in the figure shown are carriers of a genetic disorder.Based on the Punnett square,the allele that causes the disorder must be

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?

If a recessive allele causes a fatal disease that kills the affected individual before he or she can reproduce,why doesn't that allele quickly become extinct in the population?

The X chromosome in humans is

Human males have one chromosome that females do not,known as the ________ chromosome.

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

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

If a father is affected by an X-linked condition and the mother is a carrier,what is the probability of their children being affected?

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

Among children with parents who are both carriers of Tay-Sachs,an autosomal recessive disorder,chances are that

In humans,X-linked genetic diseases

A karyotype from an adult male indicates a chromosomal abnormality,which does not affect his health.Which of the following abnormalities is most likely seen?

What information is NOT visible in a karyotype?

In the pedigree shown,the individual indicated represents a(n)

A person is genetically XX and develops as a male.How can this be explained?

Which of the following statements would indicate a pedigree that shows the inheritance pattern of a recessive X-linked disease?

Except for the sex chromosomes,all the chromosomes shown in a karyotype are numbered and are called ________.

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

Ecosystems

Applying the Science

Filters

Exam 7: Chromosomes and Human Genetics

Why are dominant genetic disorders more rare than recessive disorders?

Does the pedigree shown most likely represent a condition that is autosomal recessive,dominant,or sex-linked? Explain your reasoning.

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 parents in the figure shown are carriers of a genetic disorder.Based on the Punnett square,the allele that causes the disorder must be

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?

If a recessive allele causes a fatal disease that kills the affected individual before he or she can reproduce,why doesn't that allele quickly become extinct in the population?

The X chromosome in humans is

Human males have one chromosome that females do not,known as the ________ chromosome.

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

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

If a father is affected by an X-linked condition and the mother is a carrier,what is the probability of their children being affected?

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

Among children with parents who are both carriers of Tay-Sachs,an autosomal recessive disorder,chances are that

In humans,X-linked genetic diseases

A karyotype from an adult male indicates a chromosomal abnormality,which does not affect his health.Which of the following abnormalities is most likely seen?

What information is NOT visible in a karyotype?

In the pedigree shown,the individual indicated represents a(n)

A person is genetically XX and develops as a male.How can this be explained?

Which of the following statements would indicate a pedigree that shows the inheritance pattern of a recessive X-linked disease?

Except for the sex chromosomes,all the chromosomes shown in a karyotype are numbered and are called ________.

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

Ecosystems

Applying the Science

Filters