Question 1

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. 
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 2

The independent assortment of chromosomes increases the

Accepted Answer

A)  variation between individuals. 
B)  uniformity between individuals. 
C)  the DNA sequences shared by individuals 
D)  the chances of mating between individuals 
A)  variation between individuals. 
B)  uniformity between individuals. 
C)  the DNA sequences shared by individuals 
D)  the chances of mating between individuals

Question 3

Spontaneous abortions are often due to the addition or deletion of whole ________ in the gametes that fused to form the zygote.

Accepted Answer

The answer of Spontaneous abortions are often due to the...

Question 4

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

Question 5

Which of the following statements would be true if the linkage between two traits were complete?

Accepted Answer

A)  Only the parental combinations of phenotypes could appear in the progeny. 
B)  The rules of independent assortment would hold true. 
C)  Combinations of phenotypes different from those seen in the parents would be produced. 
D)  The exchange of genetic material between chromosomes would be frequent. 
A)  Only the parental combinations of phenotypes could appear in the progeny. 
B)  The rules of independent assortment would hold true. 
C)  Combinations of phenotypes different from those seen in the parents would be produced. 
D)  The exchange of genetic material between chromosomes would be frequent.

Question 6

An individual with a heterozygous genotype who does not express the recessive trait but can pass it along to offspring is called a ________.

Accepted Answer

The answer of An individual with a heterozygous genotype who...

Question 7

The gender of a human child determined by the sperm because

Accepted Answer

A)  all sperm contain the SRY gene. 
B)  all eggs contain the SRY gene. 
C)  only eggs may contain the SRY gene. 
D)  only sperm may contain the SRY gene. 
A)  all sperm contain the SRY gene. 
B)  all eggs contain the SRY gene. 
C)  only eggs may contain the SRY gene. 
D)  only sperm may contain the SRY gene.

Question 8

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 9

The genetic disorder followed through this pedigree is

Accepted Answer

A)  recessive and X-linked. 
B)  recessive and not X-linked. 
C)  dominant and X-linked. 
D)  dominant and not X-linked. 
A)  recessive and X-linked. 
B)  recessive and not X-linked. 
C)  dominant and X-linked. 
D)  dominant and not X-linked.

Question 10

Which of the following statements about crossing-over is true?

Accepted Answer

A)  It lowers the likelihood of genetic recombination. 
B)  It disrupts the linkage between genes. 
C)  It results in the production of extra chromosomes. 
D)  It is usually fatal. 
A)  It lowers the likelihood of genetic recombination. 
B)  It disrupts the linkage between genes. 
C)  It results in the production of extra chromosomes. 
D)  It is usually fatal.

Question 11

A specific gene can be found in several possible places on a given chromosome.

Accepted Answer

A) True 
 B)False

Question 12

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

Accepted Answer

A)  be autosomal. 
B)  be sex-linked. 
C)  be incompletely dominant. 
D)  result from the linkage of A and a 
A)  be autosomal. 
B)  be sex-linked. 
C)  be incompletely dominant. 
D)  result from the linkage of A and a

Question 13

Which of the following genetic changes would NOT be heritable?

Accepted Answer

A)  a mutation in a skin cell 
B)  the loss of a chromosome in a sperm cell 
C)  the addition of a chromosome in an egg cell 
D)  a mutation in a gene in a gamete 
A)  a mutation in a skin cell 
B)  the loss of a chromosome in a sperm cell 
C)  the addition of a chromosome in an egg cell 
D)  a mutation in a gene in a gamete

Question 14

Refer to the following figure depicting fly genetic crosses.Which actual result indicates that the genes for body color and wing length in fruit flies are linked?

Accepted Answer

A)  Four different phenotypes are present in the offspring. 
B)  Parental genotypes are present in the offspring. 
C)  Nonparental genotypes are present in the offspring. 
D)  A low percentage of nonparental genotypes is present in the offspring. 
A)  Four different phenotypes are present in the offspring. 
B)  Parental genotypes are present in the offspring. 
C)  Nonparental genotypes are present in the offspring. 
D)  A low percentage of nonparental genotypes is present in the offspring.

Question 15

This pedigree diagrams an X-linked gene.The individual indicated by the question mark is ________ for the gene.

Accepted Answer

A)  heterozygous 
B)  homozygous 
C)  autosomal 
D)  There is not enough information to determine the answer. 
A)  heterozygous 
B)  homozygous 
C)  autosomal 
D)  There is not enough information to determine the answer.

Question 16

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

Accepted Answer

The answer of A chart that shows genetic relationships within...

Question 17

Crossing-over is expected to occur infrequently for genes located very close together on the same chromosome.

Accepted Answer

A) True 
 B)False

Question 18

If DNA testing reveals that you carry alleles for a particular genetic disorder,you will definitely get that disorder at some point in the future.

Accepted Answer

A) True 
 B)False

Question 19

Translocation occurs when homologous chromosomes exchange equal pieces of DNA.

Accepted Answer

A) True 
 B)False

Question 20

Sex-linked genes are found on either the X chromosome or the Y chromosome but not both.

Accepted Answer

A) True 
 B)False

Exam 10: Chromosomes and Human Genetics

During translocation,

The independent assortment of chromosomes increases the

Spontaneous abortions are often due to the addition or deletion of whole ________ in the gametes that fused to form the zygote.

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

Which of the following statements would be true if the linkage between two traits were complete?

An individual with a heterozygous genotype who does not express the recessive trait but can pass it along to offspring is called a ________.

The gender of a human child determined by the sperm because

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

The genetic disorder followed through this pedigree is

Which of the following statements about crossing-over is true?

A specific gene can be found in several possible places on a given chromosome.

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

Which of the following genetic changes would NOT be heritable?

Refer to the following figure depicting fly genetic crosses.Which actual result indicates that the genes for body color and wing length in fruit flies are linked?

This pedigree diagrams an X-linked gene.The individual indicated by the question mark is ________ for the gene.

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

Crossing-over is expected to occur infrequently for genes located very close together on the same chromosome.

If DNA testing reveals that you carry alleles for a particular genetic disorder,you will definitely get that disorder at some point in the future.

Translocation occurs when homologous chromosomes exchange equal pieces of DNA.

Sex-linked genes are found on either the X chromosome or the Y chromosome but not both.

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