Question 1

Which one of the following is TRUE regarding an individual who has inherited one sickle-cell gene and one normal gene for hemoglobin?

Accepted Answer

A)  The individual will develop sickle-cell anemia. 
B)  The individual will produce only abnormal hemoglobin. 
C)  The individual is more likely to resist malaria than an individual with two normal genes for hemoglobin. 
D)  The individual will most likely die before the age of 10 from complications associated with abnormal white blood cells. 
E)  The individual has the homozygous recessive genotype for this trait. 
A)  The individual will develop sickle-cell anemia. 
B)  The individual will produce only abnormal hemoglobin. 
C)  The individual is more likely to resist malaria than an individual with two normal genes for hemoglobin. 
D)  The individual will most likely die before the age of 10 from complications associated with abnormal white blood cells. 
E)  The individual has the homozygous recessive genotype for this trait.

Question 2

Genes represent the set of instructions for the expression of one or more traits human beings and influence human behaviors by

Accepted Answer

A)  directly causing specific changes in mood or patterns of behavior. 
B)  producing protein products that serve as switches for directly turning on or off certain behaviors. 
C)  directing the synthesis of protein products that influence but do not directly cause most human behaviors. 
D)  activating behavior pathways, like those leading to depression or happiness. 
E)  functioning as specific behavior suppressors. 
A)  directly causing specific changes in mood or patterns of behavior. 
B)  producing protein products that serve as switches for directly turning on or off certain behaviors. 
C)  directing the synthesis of protein products that influence but do not directly cause most human behaviors. 
D)  activating behavior pathways, like those leading to depression or happiness. 
E)  functioning as specific behavior suppressors.

Question 3

If alleles for the same gene are different in the same person, that individual is heterozygous for the trait.

Accepted Answer

A) True 
 B)False

Question 4

Failure of homologous chromosomes or sister chromatids to separate properly is called ________.

Accepted Answer

The answer of Failure of homologous chromosomes or sister chromatids...

Question 5

Identify the mode of inheritance for each of the following traits.
-straight vs. curly vs. wavy hair in humans

Accepted Answer

A) codominance 
B) nondisjunction 
C) sex-influenced trait 
D) polygenic inheritance 
E) incomplete dominance
F)X-linked inheritance
G)inheritance of a dominant-lethal allele 
A) codominance 
B) nondisjunction 
C) sex-influenced trait 
D) polygenic inheritance 
E) incomplete dominance
F)X-linked inheritance
G)inheritance of a dominant-lethal allele

Question 6

Identify the mode of inheritance for each of the following traits.
-Huntington disease

Accepted Answer

A) codominance 
B) nondisjunction 
C) sex-influenced trait 
D) polygenic inheritance 
E) incomplete dominance
F)X-linked inheritance
G)inheritance of a dominant-lethal allele 
A) codominance 
B) nondisjunction 
C) sex-influenced trait 
D) polygenic inheritance 
E) incomplete dominance
F)X-linked inheritance
G)inheritance of a dominant-lethal allele

Question 7

Which of the following genotypes results in a female phenotype?

Accepted Answer

A)  XY 
B)  XYY 
C)  XO 
D)  XXY 
E)  YO 
A)  XY 
B)  XYY 
C)  XO 
D)  XXY 
E)  YO

Question 8

In 2008 the U.S. Congress passed GINA, an act that prevents insurance companies from

Accepted Answer

A)  requiring genetic testing for potential policy holders with a family history of certain types of genetic disorders. 
B)  raising the rates of insurance premiums or denying coverage to people who have a pre-diagnosed health condition. 
C)  increasing insurance costs for healthy individuals based on the results of genetic testing. 
D)  denying insurance coverage to any U.S. citizen. 
E)  refusing to pay for genetic screening of a fetus of a couple considered high risk for certain types of genetic diseases. 
A)  requiring genetic testing for potential policy holders with a family history of certain types of genetic disorders. 
B)  raising the rates of insurance premiums or denying coverage to people who have a pre-diagnosed health condition. 
C)  increasing insurance costs for healthy individuals based on the results of genetic testing. 
D)  denying insurance coverage to any U.S. citizen. 
E)  refusing to pay for genetic screening of a fetus of a couple considered high risk for certain types of genetic diseases.

Question 9

Alleles are alternative versions of chromosomes.

Accepted Answer

A) True 
 B)False

Question 10

Based on the information below, answer the following question(s), assuming complete dominance.
"In humans, a widow's peak is a dominant trait, and a straight hairline is a recessive trait."
-If an individual homozygous dominant for widow's peak has a child with an individual heterozygous for widow's peak, what is the chance that the child will have a widow's peak?

Accepted Answer

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

Question 11

In polygenic inheritance,

Accepted Answer

A)  all individuals in the population are initially heterozygous for a particular trait. 
B)  the environment has no influence in phenotype expression. 
C)  the genotype makeup of individuals in a population is the only factor influencing phenotypes. 
D)  multiple alleles and genes contribute to a phenotype. 
E)  all traits are expressed as incomplete dominance. 
A)  all individuals in the population are initially heterozygous for a particular trait. 
B)  the environment has no influence in phenotype expression. 
C)  the genotype makeup of individuals in a population is the only factor influencing phenotypes. 
D)  multiple alleles and genes contribute to a phenotype. 
E)  all traits are expressed as incomplete dominance.

Question 12

Based on the information below, answer the following question(s), assuming complete dominance.
"In humans, the ability to roll the tongue is a dominant trait; the inability to roll the tongue is a recessive trait."
-If two individuals heterozygous for this trait have a child, what is the chance that the child will not be able to roll his tongue?

Accepted Answer

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

Question 13

A father is blood type B and a mother is blood type A. They have a child with blood type O. What are the genotypes of the father and mother?

Accepted Answer

A)  The father must be BB and the mother must be AO. 
B)  The father must be BO and the mother must be AA. 
C)  The father must be BO and the mother must be AO. 
D)  The father must be BB and the mother must be AA. 
E)  This isn't possible. 
A)  The father must be BB and the mother must be AO. 
B)  The father must be BO and the mother must be AA. 
C)  The father must be BO and the mother must be AO. 
D)  The father must be BB and the mother must be AA. 
E)  This isn't possible.

Question 14

Genes for different traits located on the same chromosome in close proximity are called ________ genes.

Accepted Answer

The answer of Genes for different traits located on the...

Question 15

A display of an individual's chromosomes is known as a(n) ________.

Accepted Answer

The answer of A display of an individual's chromosomes is...

Question 16

Identify the mode of inheritance for each of the following traits.
-red-green color blindness

Accepted Answer

A) codominance 
B) nondisjunction 
C) sex-influenced trait 
D) polygenic inheritance 
E) incomplete dominance
F)X-linked inheritance
G)inheritance of a dominant-lethal allele 
A) codominance 
B) nondisjunction 
C) sex-influenced trait 
D) polygenic inheritance 
E) incomplete dominance
F)X-linked inheritance
G)inheritance of a dominant-lethal allele

Question 17

Match each of the following disorders to the genotype with which it is associated.
-XXY

Accepted Answer

A) Tay-Sachs 
B) Turner syndrome 
C) Edwards syndrome 
D) Klinefelter syndrome 
E) Down syndrome 
A) Tay-Sachs 
B) Turner syndrome 
C) Edwards syndrome 
D) Klinefelter syndrome 
E) Down syndrome

Question 18

A recessive trait that is inherited through complete dominance can occur only if both parents are heterozygous for the trait.

Accepted Answer

A) True 
 B)False

Question 19

Alterations in chromosome number can occur with any chromosome, but most alterations are not seen in human populations because

Accepted Answer

A)  the phenotype is homozygous recessive. 
B)  the phenotype is expressed in a continuous range in a given population and thus does not stand out. 
C)  they are lethal during fetal development. 
D)  most are corrected during the first mitotic event in the fertilized egg. 
E)  the genotype still represents a normal condition. 
A)  the phenotype is homozygous recessive. 
B)  the phenotype is expressed in a continuous range in a given population and thus does not stand out. 
C)  they are lethal during fetal development. 
D)  most are corrected during the first mitotic event in the fertilized egg. 
E)  the genotype still represents a normal condition.

Question 20

Match each of the following disorders to the genotype with which it is associated.
-recessive allele on chromosome 15

Accepted Answer

A) Tay-Sachs 
B) Turner syndrome 
C) Edwards syndrome 
D) Klinefelter syndrome 
E) Down syndrome 
A) Tay-Sachs 
B) Turner syndrome 
C) Edwards syndrome 
D) Klinefelter syndrome 
E) Down syndrome

Exam 19: Genetics and Inheritance

Which one of the following is TRUE regarding an individual who has inherited one sickle-cell gene and one normal gene for hemoglobin?

Genes represent the set of instructions for the expression of one or more traits human beings and influence human behaviors by

If alleles for the same gene are different in the same person, that individual is heterozygous for the trait.

Failure of homologous chromosomes or sister chromatids to separate properly is called ________.

Identify the mode of inheritance for each of the following traits. -straight vs. curly vs. wavy hair in humans

Identify the mode of inheritance for each of the following traits. -Huntington disease

Which of the following genotypes results in a female phenotype?

In 2008 the U.S. Congress passed GINA, an act that prevents insurance companies from

Alleles are alternative versions of chromosomes.

In polygenic inheritance,

A father is blood type B and a mother is blood type A. They have a child with blood type O. What are the genotypes of the father and mother?

Genes for different traits located on the same chromosome in close proximity are called ________ genes.

A display of an individual's chromosomes is known as a(n) ________.

Identify the mode of inheritance for each of the following traits. -red-green color blindness

Match each of the following disorders to the genotype with which it is associated. -XXY

A recessive trait that is inherited through complete dominance can occur only if both parents are heterozygous for the trait.

Alterations in chromosome number can occur with any chromosome, but most alterations are not seen in human populations because

Match each of the following disorders to the genotype with which it is associated. -recessive allele on chromosome 15

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