Question 1

XYY males tend to

Accepted Answer

A)  have reproductive problems. 
B)  be slightly retarded. 
C)  have learning disabilities. 
D)  be sterile. 
E)  develop normally. 
A)  have reproductive problems. 
B)  be slightly retarded. 
C)  have learning disabilities. 
D)  be sterile. 
E)  develop normally.

Question 2

The sex chromosome composition of a person with Klinefelter syndrome is most accurately written as

Accepted Answer

A)  XXX. 
B)  XO. 
C)  XXY. 
D)  XYY. 
E)  YO. 
A)  XXX. 
B)  XO. 
C)  XXY. 
D)  XYY. 
E)  YO.

Question 3

A set of symptoms that characterize a disorder is referred to as

Accepted Answer

A)  an abnormality. 
B)  a disorder. 
C)  a syndrome. 
D)  lethality. 
E)  a pedigree. 
A)  an abnormality. 
B)  a disorder. 
C)  a syndrome. 
D)  lethality. 
E)  a pedigree.

Question 4

In cats, the allele B produces black, while b produces yellow. Neither gene is dominant, and in the heterozygous state, the phenotype is a combination of yellow and black spots called tortoiseshell. The alleles B and b are X-linked. If a tortoiseshell cat has three tortoiseshell kittens and two black kittens, give the genotype and phenotype of the tomcat that produced them, and give the sex of the kittens.

Accepted Answer

BY black,

Question 5

Autosomes in karyotypes are arranged

Accepted Answer

A)  in descending size order. 
B)  in ascending size order. 
C)  randomly. 
D)  with the sex chromosomes at the beginning. 
E)  with all of the same-sized chromosomes grouped together. 
A)  in descending size order. 
B)  in ascending size order. 
C)  randomly. 
D)  with the sex chromosomes at the beginning. 
E)  with all of the same-sized chromosomes grouped together.

Question 6

A chromosome's gene sequence that was A - B - C - D - E - F - G before damage and A - B - C - F - G after is an example of

Accepted Answer

A)  inversion. 
B)  deletion. 
C)  duplication. 
D)  translocation. 
E)  crossing over. 
A)  inversion. 
B)  deletion. 
C)  duplication. 
D)  translocation. 
E)  crossing over.

Question 7

If a daughter expresses an X-linked recessive gene, she inherited the trait from

Accepted Answer

A)  her mother. 
B)  her father. 
C)  both parents. 
D)  neither parent. 
E)  her grandmother. 
A)  her mother. 
B)  her father. 
C)  both parents. 
D)  neither parent. 
E)  her grandmother.

Question 8

White eyes in Drosophila is a mutation that turned out to be X-linked recessive. Would you expect that the white eye was discovered the first time in a male or female?

Accepted Answer

The answer of White eyes in Drosophila is a mutation...

Question 9

Which of the following is NOT true concerning homologous chromosomes?

Accepted Answer

A)  There are two of each kind. 
B)  Each parent contributes one of each homologous pair. 
C)  Most homologous chromosomes carry the same genes for the same traits. 
D)  The number of homologous chromosomes is doubled in each generation. 
E)  Homologous chromosomes pair up during early meiosis. 
A)  There are two of each kind. 
B)  Each parent contributes one of each homologous pair. 
C)  Most homologous chromosomes carry the same genes for the same traits. 
D)  The number of homologous chromosomes is doubled in each generation. 
E)  Homologous chromosomes pair up during early meiosis.

Question 10

Red-green color blindness is an X-linked recessive trait in humans. A color-blind woman and a man with normal vision have a son. What is the probability that the son is color-blind?

Accepted Answer

A)  100 percent 
B)  75 percent 
C)  50 percent 
D)  25 percent 
E)  0 percent 
A)  100 percent 
B)  75 percent 
C)  50 percent 
D)  25 percent 
E)  0 percent

Question 11

Which substance is defective in Marfan syndrome?

Accepted Answer

A)  sphingolipids 
B)  albumin 
C)  fibrillin 
D)  amyloid 
E)  LDLs 
A)  sphingolipids 
B)  albumin 
C)  fibrillin 
D)  amyloid 
E)  LDLs

Question 12

The location of a gene on a chromosome is its

Accepted Answer

A)  centromere. 
B)  locus. 
C)  autosome. 
D)  allele. 
E)  centriole. 
A)  centromere. 
B)  locus. 
C)  autosome. 
D)  allele. 
E)  centriole.

Question 13

When the result of some genetic condition is a severe medical problem to the individual, it is called

Accepted Answer

A)  an abnormality. 
B)  a disorder. 
C)  a deviation. 
D)  a carrier. 
E)  a pedigree. 
A)  an abnormality. 
B)  a disorder. 
C)  a deviation. 
D)  a carrier. 
E)  a pedigree.

Question 14

Which mutated gene is inherited in cases of cystic fibrosis?

Accepted Answer

A)  BRCA-1 
B)  BRCA-2 
C)  aPOE-4 
D)  aPOE-2 
E)  CFTR 
A)  BRCA-1 
B)  BRCA-2 
C)  aPOE-4 
D)  aPOE-2 
E)  CFTR

Question 15

Match between columns
                        Premises: Following a gene duplication event involving only five loci, how many chromosomes will a human female have?
How many chromosomes does each somatic cell have in a human male who has two X chromosomes?
How many chromosomes are present in each cell of the germ cell line for a tetraploid species where its normal complement of chromosomes is 48?
How many chromosomes are present in the somatic cells of a child born with Down syndrome (trisomy 21)?
The normal sperm cell of a particular species carries 11 chromosomes. Following nondisjunction in the formation of secondary spermatocytes and their subsequent fertilization of normal ova, some of the zygotes will have 21 chromosomes, others will have 22, and the remainder will have how many chromosomes?

Accepted Answer

The Answer of 47 and 24 and 46 and 23 is...

Question 16

Two Drosophila are crossed several times, with a total number of offspring of 106 females and 48 males. There is too great a deviation from the expected 1:1 ratio for chance alone to account for the difference. What other factor could account for this difference?

Accepted Answer

a sex-linked recessi

Question 17

A disease that is associated with changes in chloride and water movement into and out of exocrine glands, dry and thickened mucus in the airways, and an increase in the incidence of respiratory infections is

Accepted Answer

A)  pneumonia. 
B)  influenza. 
C)  cystic fibrosis. 
D)  bird flu. 
E)  lung cancer. 
A)  pneumonia. 
B)  influenza. 
C)  cystic fibrosis. 
D)  bird flu. 
E)  lung cancer.

Question 18

An autosomal recessive disorder

Accepted Answer

A)  requires that only one parent be a carrier. 
B)  displays its symptoms only in heterozygotes. 
C)  is more frequent in males than females. 
D)  can appear only in children of parents who both carry the gene. 
E)  is dominant in females. 
A)  requires that only one parent be a carrier. 
B)  displays its symptoms only in heterozygotes. 
C)  is more frequent in males than females. 
D)  can appear only in children of parents who both carry the gene. 
E)  is dominant in females.

Question 19

Down syndrome involves trisomy of chromosome number

Accepted Answer

A)  3. 
B)  5. 
C)  15. 
D)  19. 
E)  21. 
A)  3. 
B)  5. 
C)  15. 
D)  19. 
E)  21.

Question 20

An autosomal dominant condition that causes a person to grow no taller than about 4 feet 4 inches is

Accepted Answer

A)  Marfan syndrome. 
B)  Tay-Sachs disease. 
C)  Huntington disease. 
D)  achondroplasia. 
E)  phenylketonuria. 
A)  Marfan syndrome. 
B)  Tay-Sachs disease. 
C)  Huntington disease. 
D)  achondroplasia. 
E)  phenylketonuria.

Exam 20: Chromosomes and Human Genetics

XYY males tend to

The sex chromosome composition of a person with Klinefelter syndrome is most accurately written as

A set of symptoms that characterize a disorder is referred to as

Autosomes in karyotypes are arranged

A chromosome's gene sequence that was A - B - C - D - E - F - G before damage and A - B - C - F - G after is an example of

If a daughter expresses an X-linked recessive gene, she inherited the trait from

White eyes in Drosophila is a mutation that turned out to be X-linked recessive. Would you expect that the white eye was discovered the first time in a male or female?

Which of the following is NOT true concerning homologous chromosomes?

Red-green color blindness is an X-linked recessive trait in humans. A color-blind woman and a man with normal vision have a son. What is the probability that the son is color-blind?

Which substance is defective in Marfan syndrome?

The location of a gene on a chromosome is its

When the result of some genetic condition is a severe medical problem to the individual, it is called

Which mutated gene is inherited in cases of cystic fibrosis?

Two Drosophila are crossed several times, with a total number of offspring of 106 females and 48 males. There is too great a deviation from the expected 1:1 ratio for chance alone to account for the difference. What other factor could account for this difference?

A disease that is associated with changes in chloride and water movement into and out of exocrine glands, dry and thickened mucus in the airways, and an increase in the incidence of respiratory infections is

An autosomal recessive disorder

Down syndrome involves trisomy of chromosome number

An autosomal dominant condition that causes a person to grow no taller than about 4 feet 4 inches is

Learning About Human Biology

Chemistry of Life

Cells and How They Work

Tissues, Organs, and Organ Systems

The Skeletal System

The Muscular System

Circulation: the Heart and Blood Vessels

Blood

Immunity and Disease

The Respiratory System

Digestion and Nutrition

The Urinary System

The Nervous System

Sensory Systems

The Endocrine System

Reproductive Systems

Development and Aging

Cell Reproduction

Introduction to Genetics

DNA, Genes, and Biotechnology

Genes and Disease: Cancer

Principles of Evolution

Principles of Ecology

Human Impacts on the Biosphere

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