Question 1

When one parent passes on a dominant defective allele,what chance does the child have of manifesting the disorder?

Accepted Answer

A)  A 100 percent chance 
B)  A 75 percent chance 
C)  A 50 percent chance 
D)  A 25 percent chance 
A)  A 100 percent chance 
B)  A 75 percent chance 
C)  A 50 percent chance 
D)  A 25 percent chance C

Question 2

What disorder resulting from nondisjunction of sex chromosomes causes a syndrome whose characteristics include a webbed neck and short stature?

Accepted Answer

A)  Klinefelter syndrome 
B)  Cystic fibrosis 
C)  Huntington's disease 
D)  Turner syndrome 
A)  Klinefelter syndrome 
B)  Cystic fibrosis 
C)  Huntington's disease 
D)  Turner syndrome D

Question 3

Which of the following occur in equal pairs in both males and females but do not play a role in determination of gender?

Accepted Answer

A)  Genomes 
B)  Chromosomes 
C)  Alleles 
D)  Autosomes 
A)  Genomes 
B)  Chromosomes 
C)  Alleles 
D)  Autosomes D

Question 4

Which of the following is most likely to produce a mutation in genetic material?

Accepted Answer

A)  Smoking 
B)  High-fat diet 
C)  Vitamin deficiency 
D)  Exposure to certain chemicals 
A)  Smoking 
B)  High-fat diet 
C)  Vitamin deficiency 
D)  Exposure to certain chemicals

Question 5

In autosomal recessive disorders,what happens to children who inherit one copy of the allele?

Accepted Answer

A)  The disorder manifests itself. 
B)  They become carriers of the disorder. 
C)  They are unaffected by the disorder. 
D)  Any of the above is possible. 
A)  The disorder manifests itself. 
B)  They become carriers of the disorder. 
C)  They are unaffected by the disorder. 
D)  Any of the above is possible.

Question 6

Which statement about female gametes is correct?

Accepted Answer

A)  Female gametes contain a single X chromosome. 
B)  Female gametes contain two X chromosomes. 
C)  Female gametes may contain either an X or a Y chromosome. 
D)  Female gametes contain both an X and a Y chromosome. 
A)  Female gametes contain a single X chromosome. 
B)  Female gametes contain two X chromosomes. 
C)  Female gametes may contain either an X or a Y chromosome. 
D)  Female gametes contain both an X and a Y chromosome.

Question 7

In general,what happens when an allele for brown eyes is paired with an allele for blue eyes?

Accepted Answer

A)  The offspring will be heterozygous for the trait and have brown eyes. 
B)  The offspring will be homozygous for the trait and have blue eyes. 
C)  The offspring will be heterozygous for the trait and have blue eyes. 
D)  The offspring will be homozygous for the trait and have brown eyes. 
A)  The offspring will be heterozygous for the trait and have brown eyes. 
B)  The offspring will be homozygous for the trait and have blue eyes. 
C)  The offspring will be heterozygous for the trait and have blue eyes. 
D)  The offspring will be homozygous for the trait and have brown eyes.

Question 8

How is gender determined?

Accepted Answer

A)  Through environmental variables 
B)  By the presence or absence of certain chromosomes 
C)  By the mother's body temperature at the time of fertilization 
D)  By the timing of fertilization 
A)  Through environmental variables 
B)  By the presence or absence of certain chromosomes 
C)  By the mother's body temperature at the time of fertilization 
D)  By the timing of fertilization

Question 9

Why does the locus of each gene not vary from person to person?

Accepted Answer

A)  So that the genes supplied by the egg can align with the similar genes supplied by the sperm 
B)  To prevent gene mutation 
C)  So that fertilization can occur and produce offspring with equal genes from both parents 
D)  So that a person's gender can be determined 
A)  So that the genes supplied by the egg can align with the similar genes supplied by the sperm 
B)  To prevent gene mutation 
C)  So that fertilization can occur and produce offspring with equal genes from both parents 
D)  So that a person's gender can be determined

Question 10

A person who has two alleles that are the same is said to be what?

Accepted Answer

A)  Heterozygous for the trait 
B)  Homozygous for the trait 
C)  Homologous for the trait 
D)  Autosomal for the trait 
A)  Heterozygous for the trait 
B)  Homozygous for the trait 
C)  Homologous for the trait 
D)  Autosomal for the trait

Question 11

Klinefelter syndrome,which becomes apparent at puberty when secondary sexual characteristics fail to develop,results from

Accepted Answer

A)  nondisjunction of autosomal chromosomes. 
B)  nondisjunction of sex chromosomes. 
C)  disjunction of autosomal chromosomes. 
D)  disjunction of sex chromosomes. 
A)  nondisjunction of autosomal chromosomes. 
B)  nondisjunction of sex chromosomes. 
C)  disjunction of autosomal chromosomes. 
D)  disjunction of sex chromosomes.

Question 12

A person who has two different alleles for the same trait is said to be what?

Accepted Answer

A)  Heterozygous for the trait 
B)  Homozygous for the trait 
C)  Homologous for the trait 
D)  Autosomal for the trait 
A)  Heterozygous for the trait 
B)  Homozygous for the trait 
C)  Homologous for the trait 
D)  Autosomal for the trait

Question 13

When two alleles for the same trait are both expressed,you know that

Accepted Answer

A)  both alleles are recessive. 
B)  one allele is dominant. 
C)  the alleles are codominant. 
D)  the alleles are heterozygous. 
A)  both alleles are recessive. 
B)  one allele is dominant. 
C)  the alleles are codominant. 
D)  the alleles are heterozygous.

Question 14

A complete set of genetic information for one person is called a

Accepted Answer

A)  gene. 
B)  genome. 
C)  autosome. 
D)  chromosome. 
A)  gene. 
B)  genome. 
C)  autosome. 
D)  chromosome.

Question 15

What do you know about a person who has a recessive allele for a particular trait but who does not show that trait?

Accepted Answer

A)  He or she is heterozygous for that trait. 
B)  His or her alleles are codominant. 
C)  Two recessive alleles are present. 
D)  A gene mutation has occurred. 
A)  He or she is heterozygous for that trait. 
B)  His or her alleles are codominant. 
C)  Two recessive alleles are present. 
D)  A gene mutation has occurred.

Question 16

Which statement about nondisjunction is correct?

Accepted Answer

A)  Nondisjunction occurs when a pair of chromosomes separates during meiosis. 
B)  The most common cause of nondisjunction is a permanent change in genetic material. 
C)  Color blindness is a common disorder resulting from nondisjunction. 
D)  Nondisjunction results in one daughter cell lacking a particular chromosome. 
A)  Nondisjunction occurs when a pair of chromosomes separates during meiosis. 
B)  The most common cause of nondisjunction is a permanent change in genetic material. 
C)  Color blindness is a common disorder resulting from nondisjunction. 
D)  Nondisjunction results in one daughter cell lacking a particular chromosome.

Question 17

Which statement about sex-linked disorders is correct?

Accepted Answer

A)  A female who inherits an allele for a sex-linked disorder will develop Turner syndrome. 
B)  A female who inherits an allele for a sex-linked disorder will never express any symptoms. 
C)  A male who inherits an allele for a sex-linked disorder will always express the disorder. 
D)  A male who inherits an allele for a sex-linked disorder will express the disorder only if he has a matching allele for the disorder. 
A)  A female who inherits an allele for a sex-linked disorder will develop Turner syndrome. 
B)  A female who inherits an allele for a sex-linked disorder will never express any symptoms. 
C)  A male who inherits an allele for a sex-linked disorder will always express the disorder. 
D)  A male who inherits an allele for a sex-linked disorder will express the disorder only if he has a matching allele for the disorder.

Exam 25: Heredity

When one parent passes on a dominant defective allele,what chance does the child have of manifesting the disorder?

What disorder resulting from nondisjunction of sex chromosomes causes a syndrome whose characteristics include a webbed neck and short stature?

Which of the following occur in equal pairs in both males and females but do not play a role in determination of gender?

Which of the following is most likely to produce a mutation in genetic material?

In autosomal recessive disorders,what happens to children who inherit one copy of the allele?

Which statement about female gametes is correct?

In general,what happens when an allele for brown eyes is paired with an allele for blue eyes?

How is gender determined?

Why does the locus of each gene not vary from person to person?

A person who has two alleles that are the same is said to be what?

Klinefelter syndrome,which becomes apparent at puberty when secondary sexual characteristics fail to develop,results from

A person who has two different alleles for the same trait is said to be what?

When two alleles for the same trait are both expressed,you know that

A complete set of genetic information for one person is called a

What do you know about a person who has a recessive allele for a particular trait but who does not show that trait?

Which statement about nondisjunction is correct?

Which statement about sex-linked disorders is correct?

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