Question 1

The approximate number of protein-encoding genes on the Y chromosome is

Accepted Answer

A)  >1,500.
B)  231.
C)  10.
D)  greater in males than females.E) A) and B)
F) None of the above

Question 2

Genetics is the study of

Accepted Answer

A)  sperm and eggs.
B)  the effect of the environment on health.
C)  inheritance of characteristics.
D)  DNA.E) All of the above
F) None of the above

Question 3

The human genome consists of

Accepted Answer

A)  DNA, most of which encodes protein.
B)  DNA, most of which does not encode protein.
C)  DNA, most of which encodes RNA.
D)  protein, most of which does not encode DNA.E) B) and C)
F) A) and D)

Question 4

Freckles are a phenotype and the allele combination that causes a clotting disorder is a genotype.

Accepted Answer

A) True 
 B)False

Question 5

Genetic information passes from protein to RNA to DNA.

Accepted Answer

A) True 
 B)False

Question 6

Cells from a woman with Turner syndrome have

Accepted Answer

A)  an extra X chromosome.
B)  one X and two Y chromosomes.
C)  only one X chromosome.
D)  no sex chromosomes.E) C) and D)
F) A) and B)

Question 7

A recessive allele masks the effect of a dominant allele.

Accepted Answer

A) True 
 B)False

Question 8

A human cell with 46 chromosomes is

Accepted Answer

A)  aneuploid.
B)  euploid.
C)  polyploid.
D)  haploid.E) A) and B)
F) A) and C)

Question 9

Genetics is the study of the inheritance of traits and their variability.

Accepted Answer

A) True 
 B)False

Question 10

A bell curve is characteristic of the distribution of phenotypes of a multifactorial trait because

Accepted Answer

A)  the phenotypes in the middle of the curve correspond to fewer genotypes than the phenotypes at the ends of the distribution.
B)  the phenotypes at the ends of the curve correspond to fewer genotypes than the phenotypes at the middle of the distribution.
C)  most people are average for the trait.
D)  people at the extreme ends of the distribution do not survive to reproduce.E) A) and D)
F) C) and D)

Question 11

Which of the following chromosomal abnormalities most severely affect a fetus?

Accepted Answer

A)  XXX
B)  Monosomy for a large autosome
C)  Trisomy 21
D)  XXYE) B) and C)
F) A) and D)

Question 12

Hemophilia A is

Accepted Answer

A)  due to an X-linked dominant gene.
B)  passed from affected males to their sons.
C)  more common in females.
D)  a defect in the clotting mechanism.E) A) and D)
F) A) and C)

Question 13

An allele that masks the effect of another is

Accepted Answer

A)  homozygous.
B)  heterozygous.
C)  recessive.
D)  dominant.E) A) and B)
F) A) and C)

Question 14

A woman insists on an ultrasound and a maternal serum marker test to check for Trisomy 21 in her unborn child because she only wants to use non-invasive methods. Her obstetrician will

Accepted Answer

A)  follow the procedures she wants, because ultrasound and maternal serum markers check chromosomes while CVS and amniocentesis do not.
B)  heavily advise against this decision, because ultrasound and maternal serum markers do not check chromosomes while CVS and amniocentesis do.
C)  allow the maternal serum marker test but still recommend amniocentesis, because maternal serum markers and amniocentesis check chromosomes while ultrasound and CVS do not.
D)  allow the ultrasound but still recommend CVS, because ultrasound and CVS check chromosomes while maternal serum markers and amniocentesis do not.E) A) and C)
F) A) and D)

Question 15

An individual who is homozygous dominant for a trait can be symbolized

Accepted Answer

A)  AA.
B)  Aa.
C)  aa.
D)  None of the answer choices are correct.E) None of the above
F) A) and B)

Question 16

Phenylketonuria (PKU) is a genetic disease caused by mutation of the PAH gene, which normally produces the enzyme phenylalanine hydroxase. This enzyme is essential for the conversion of the amino acid phenylalanine into tyrosine. Without the enzyme, phenylalanine builds up in the blood and tissues of various body regions. It can produce severe skin discolorations and foul odor, but also intellectual disabilities and behavioral problems. Some people may experience only one type of PKU symptoms and not the others. PKU is an example of

Accepted Answer

A)  genetic heterogeneity.
B)  complete penetrance.
C)  incomplete penetrance.
D)  pleiotropy.E) None of the above
F) A) and D)

Question 17

Identical alleles are said to be

Accepted Answer

A)  homozygous.
B)  heterozygous.
C)  recessive.
D)  dominant.E) A) and B)
F) A) and C)

Question 18

The muscle disorder myotonic dystrophy can be caused by different genes, on different chromosomes. This means that the condition is genetically heterogeneic.

Accepted Answer

A) True 
 B)False

Question 19

In a certain species of fly, eye color is designated by the W+ and w alleles, with the W+ allele being dominant. Typical eye color is red for these flies, while a rarer white color variant exists. In this species, W+ is the ________ and w is a ________.

Accepted Answer

The answer of In a certain species of fly, eye...

Question 20

Gender determination for males reflects expression of

Accepted Answer

A)  the SRY gene but not the Wnt4 gene.
B)  the Wnt4 gene but not the SRY gene.
C)  both the SRY and Wnt4 genes.
D)  the entire Y chromosome.E) None of the above
F) B) and D)

Exam 24: Genetics and Genomics

The muscle disorder myotonic dystrophy can be caused by different genes, on different chromosomes. This means that the condition is genetically heterogeneic.

Correct Answer
verified

An individual who is homozygous dominant for a trait can be symbolized

Correct Answer
verified

An allele that masks the effect of another is

Correct Answer
verified

Genetic information passes from protein to RNA to DNA.

Correct Answer
verified

Hemophilia A is

Correct Answer
verified

A human cell with 46 chromosomes is

Correct Answer
verified

Identical alleles are said to be

Correct Answer
verified

Which of the following chromosomal abnormalities most severely affect a fetus?

Correct Answer
verified

The approximate number of protein-encoding genes on the Y chromosome is

Correct Answer
verified

Cells from a woman with Turner syndrome have

Correct Answer
verified

A bell curve is characteristic of the distribution of phenotypes of a multifactorial trait because

Correct Answer
verified

The human genome consists of

Correct Answer
verified

A recessive allele masks the effect of a dominant allele.

Correct Answer
verified

A woman insists on an ultrasound and a maternal serum marker test to check for Trisomy 21 in her unborn child because she only wants to use non-invasive methods. Her obstetrician will

Correct Answer
verified

Freckles are a phenotype and the allele combination that causes a clotting disorder is a genotype.

Correct Answer
verified

Correct Answer
verified

In a certain species of fly, eye color is designated by the W+ and w alleles, with the W+ allele being dominant. Typical eye color is red for these flies, while a rarer white color variant exists. In this species, W+ is the and w is a .

Correct Answer
verified

Genetics is the study of

Correct Answer
verified

Gender determination for males reflects expression of

Correct Answer
verified

Genetics is the study of the inheritance of traits and their variability.

Correct Answer
verified

Exam 24: Genetics and Genomics

The muscle disorder myotonic dystrophy can be caused by different genes, on different chromosomes. This means that the condition is genetically heterogeneic.

Correct AnswerverifiedShow Answer

An individual who is homozygous dominant for a trait can be symbolized

Correct AnswerverifiedShow Answer

An allele that masks the effect of another is

Correct AnswerverifiedShow Answer

Genetic information passes from protein to RNA to DNA.

Correct AnswerverifiedShow Answer

Hemophilia A is

Correct AnswerverifiedShow Answer

A human cell with 46 chromosomes is

Correct AnswerverifiedShow Answer

Identical alleles are said to be

Correct AnswerverifiedShow Answer

Which of the following chromosomal abnormalities most severely affect a fetus?

Correct AnswerverifiedShow Answer

The approximate number of protein-encoding genes on the Y chromosome is

Correct AnswerverifiedShow Answer

Cells from a woman with Turner syndrome have

Correct AnswerverifiedShow Answer

A bell curve is characteristic of the distribution of phenotypes of a multifactorial trait because

Correct AnswerverifiedShow Answer

The human genome consists of

Correct AnswerverifiedShow Answer

A recessive allele masks the effect of a dominant allele.

Correct AnswerverifiedShow Answer

A woman insists on an ultrasound and a maternal serum marker test to check for Trisomy 21 in her unborn child because she only wants to use non-invasive methods. Her obstetrician will

Correct AnswerverifiedShow Answer

Freckles are a phenotype and the allele combination that causes a clotting disorder is a genotype.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

In a certain species of fly, eye color is designated by the W+ and w alleles, with the W+ allele being dominant. Typical eye color is red for these flies, while a rarer white color variant exists. In this species, W+ is the ________ and w is a ________.

Correct AnswerverifiedShow Answer

Genetics is the study of

Correct AnswerverifiedShow Answer

Gender determination for males reflects expression of

Correct AnswerverifiedShow Answer

Genetics is the study of the inheritance of traits and their variability.

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
verified

In a certain species of fly, eye color is designated by the W+ and w alleles, with the W+ allele being dominant. Typical eye color is red for these flies, while a rarer white color variant exists. In this species, W+ is the and w is a .

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified