Question 1

Absence of the SRY gene and expression of the Wnt4 gene are necessary for female reproductive structures to develop in an embryo and fetus.

Accepted Answer

A) True 
 B)False  True

Question 2

The genotypes and phenotypes that result from a cross of AA and Aa (A = normal pigmentation and a = albinism)are

Accepted Answer

A) phenotypes:all normal; genotypes:50% homozygous dominant and 50% heterozygous. 
B) phenotypes:50% normal and 50% albino; genotypes:all heterozygous. 
C) phenotypes:75% normal and 25% albino; genotypes:75% heterozygous and 25% homozygous. 
D) phenotypes:all albino; genotypes:50% heterozygous and 50% homozygous recessive. 
A) phenotypes:all normal; genotypes:50% homozygous dominant and 50% heterozygous. 
B) phenotypes:50% normal and 50% albino; genotypes:all heterozygous. 
C) phenotypes:75% normal and 25% albino; genotypes:75% heterozygous and 25% homozygous. 
D) phenotypes:all albino; genotypes:50% heterozygous and 50% homozygous recessive. A

Question 3

The origin of the 46 chromosomes in a human zygote is

Accepted Answer

A) all from the sperm cell. 
B) half from DNA and half from RNA. 
C) half from the sperm and half from the egg. 
D) all from the egg. 
A) all from the sperm cell. 
B) half from DNA and half from RNA. 
C) half from the sperm and half from the egg. 
D) all from the egg. C

Question 4

The human genome contains millions of different genes.

Accepted Answer

A) True 
 B)False

Question 5

After receiving a karyotype of a fetus, it is discovered that it has Klinefelter's syndrome. What does this designation indicate?

Accepted Answer

A) The fetus is female and resulted from one of the gametes having an extra X chromosome. 
B) The fetus is an XY male. 
C) The fetus is male and the result of a Y-bearing sperm fertilizing an XX egg. 
D) The fetus is female and the result of only one gamete possessing an X chromosome. 
A) The fetus is female and resulted from one of the gametes having an extra X chromosome. 
B) The fetus is an XY male. 
C) The fetus is male and the result of a Y-bearing sperm fertilizing an XX egg. 
D) The fetus is female and the result of only one gamete possessing an X chromosome.

Question 6

The nuances of eye color arise from

Accepted Answer

A) the numbers of rods and cones in the retina. 
B) the way pigments are deposited in the iris. 
C) how much vitamin A is in a person's diet. 
D) multiple alleles of at least 10 genes. 
A) the numbers of rods and cones in the retina. 
B) the way pigments are deposited in the iris. 
C) how much vitamin A is in a person's diet. 
D) multiple alleles of at least 10 genes.

Question 7

A woman wishes to have her unborn child tested for genetic disorders and see a full karyotype of her child's genome but does not want to have the amniotic sac punctured to retrieve samples. Which of the following tests will give the most accurate and thorough examination of the fetal genome without puncturing the amniotic sac to retrieve fetal DNA?

Accepted Answer

A) Amniocentesis 
B) Chorionic villus sampling 
C) Ultrasonography 
D) Maternal serum marker screening 
A) Amniocentesis 
B) Chorionic villus sampling 
C) Ultrasonography 
D) Maternal serum marker screening

Question 8

A human cell that has 69 chromosomes is

Accepted Answer

A) aneuploid. 
B) triploid. 
C) diploid. 
D) euploid. 
A) aneuploid. 
B) triploid. 
C) diploid. 
D) euploid.

Question 9

A couple is trying to calculate the chance of genetic traits in their potential offspring. From family history, the man presumes he is heterozygous for the height gene via the "tall" allele (T). His partner is short in stature, so she believes she is homozygous for the height gene via the "short" allele (t). Assuming the "tall" allele is completely dominant, what is the chance that their offspring would be tall in stature?

Accepted Answer

A) 25% 
B) 50% 
C) 75% 
D) 100% 
A) 25% 
B) 50% 
C) 75% 
D) 100%

Question 10

Most of the DNA in the human genome encodes protein.

Accepted Answer

A) True 
 B)False

Question 11

How alike are our genomes?

Accepted Answer

A) About 10% 
B) About 25% 
C) About 75% 
D) Nearly 100% 
A) About 10% 
B) About 25% 
C) About 75% 
D) Nearly 100%

Question 12

The genotypes and phenotypes that result from the cross of Aa and Aa (A = normal pigmentation and a = albinism)are

Accepted Answer

A) phenotypes:75% normal and 25% albino; genotypes:25% homozygous dominant and 50% heterozygous and 25% homozygous recessive. 
B) phenotypes:50% normal and 50% albino; genotypes:all homozygous recessive. 
C) phenotypes:50% normal and 50% albino; genotypes:50% homozygous recessive and 50% homozygous dominant. 
D) phenotypes:25% normal and 75% albino; genotypes:25% homozygous dominant and 50% heterozygous and 25% homozygous recessive. 
A) phenotypes:75% normal and 25% albino; genotypes:25% homozygous dominant and 50% heterozygous and 25% homozygous recessive. 
B) phenotypes:50% normal and 50% albino; genotypes:all homozygous recessive. 
C) phenotypes:50% normal and 50% albino; genotypes:50% homozygous recessive and 50% homozygous dominant. 
D) phenotypes:25% normal and 75% albino; genotypes:25% homozygous dominant and 50% heterozygous and 25% homozygous recessive.

Question 13

An offspring of parents whose genotypes are Aa and Aa may be

Accepted Answer

A) only Aa. 
B) AA or aa. 
C) AA, Aa, or aa. 
D) only aa. 
A) only Aa. 
B) AA or aa. 
C) AA, Aa, or aa. 
D) only aa.

Question 14

We can predict the likelihood of a particular inherited trait occurring in a particular family member by consulting the ways that genes are transmitted on chromosomes.

Accepted Answer

A) True 
 B)False

Question 15

In von Willebrand disease, which is either autosomal recessive or autosomal dominant, clotting time slows and the person bruises and bleeds easily. Not everyone who inherits the disease genotype actually develops the phenotype. Affected individuals have differing degrees of difficulty in blood clotting. This condition is

Accepted Answer

A) completely penetrant, variably expressive, and not genetically heterogeneic. 
B) incompletely penetrant, variably expressive, and genetically heterogeneic. 
C) completely penetrant, invariably expressive, and not genetically heterogeneic. 
D) pleiotropic and genetically heterogeneic. 
A) completely penetrant, variably expressive, and not genetically heterogeneic. 
B) incompletely penetrant, variably expressive, and genetically heterogeneic. 
C) completely penetrant, invariably expressive, and not genetically heterogeneic. 
D) pleiotropic and genetically heterogeneic.

Question 16

Antonio is colorblind. His partner Emilia is not colorblind nor is she a carrier (heterozygote)for colorblindness. The offspring of this couple would

Accepted Answer

A) be sons with colorblindness and daughters with color vision. 
B) be colorblind daughters and sons with normal color vision. 
C) all be colorblind. 
D) all have normal color vision. 
A) be sons with colorblindness and daughters with color vision. 
B) be colorblind daughters and sons with normal color vision. 
C) all be colorblind. 
D) all have normal color vision.

Question 17

In genomic imprinting, the sex of a parent transmitting an allele is important in the phenotype of the offspring.

Accepted Answer

A) True 
 B)False

Question 18

Gametes pass genetic information from generation to generation.

Accepted Answer

A) True 
 B)False

Question 19

An example of a sex-influenced trait is

Accepted Answer

A) baldness. 
B) hemophilia. 
C) colorblindness. 
D) hypertension. 
A) baldness. 
B) hemophilia. 
C) colorblindness. 
D) hypertension.

Question 20

A karyotype is

Accepted Answer

A) a diagram that represents family relationships. 
B) a size-ordered chart of chromosomes. 
C) a genome sequence. 
D) a website that lists genes and the proteins they encode. 
A) a diagram that represents family relationships. 
B) a size-ordered chart of chromosomes. 
C) a genome sequence. 
D) a website that lists genes and the proteins they encode.

Exam 24: Genetics and Genomics

Absence of the SRY gene and expression of the Wnt4 gene are necessary for female reproductive structures to develop in an embryo and fetus.

The genotypes and phenotypes that result from a cross of AA and Aa (A = normal pigmentation and a = albinism)are

The origin of the 46 chromosomes in a human zygote is

The human genome contains millions of different genes.

After receiving a karyotype of a fetus, it is discovered that it has Klinefelter's syndrome. What does this designation indicate?

The nuances of eye color arise from

A human cell that has 69 chromosomes is

Most of the DNA in the human genome encodes protein.

How alike are our genomes?

The genotypes and phenotypes that result from the cross of Aa and Aa (A = normal pigmentation and a = albinism)are

An offspring of parents whose genotypes are Aa and Aa may be

We can predict the likelihood of a particular inherited trait occurring in a particular family member by consulting the ways that genes are transmitted on chromosomes.

Antonio is colorblind. His partner Emilia is not colorblind nor is she a carrier (heterozygote)for colorblindness. The offspring of this couple would

In genomic imprinting, the sex of a parent transmitting an allele is important in the phenotype of the offspring.

Gametes pass genetic information from generation to generation.

An example of a sex-influenced trait is

A karyotype is

Introduction to Human Anatomy and Physiology

Chemical Basis of Life

Cells

Cellular Metabolism

Tissues

Integumentary System

Skeletal System

Joints of the Skeletal System

Muscular System

Nervous System I: Basic Structure and Function

Nervous System II: Divisions of the Nervous System

Nervous System III: Senses

Endocrine System

Blood

Cardiovascular System

Lymphatic System and Immunity

Digestive System

Nutrition and Metabolism

Respiratory System

Urinary System

Water, Electrolyte, and Acid-Base Balance

Reproductive Systems

Pregnancy, Growth, and Development

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