Question 1

Failure of sister chromatids to separate properly is called

Accepted Answer

A)  segregation. 
B)  nondisjunction. 
C)  crossing-over. 
D)  hemophilia. 
E)  translocation. 
A)  segregation. 
B)  nondisjunction. 
C)  crossing-over. 
D)  hemophilia. 
E)  translocation.

Question 2

Match each of the following disorders to the genotype with which it is associated.
-trisomy 18

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 3

If a piece of chromosome breaks off during mitosis or meiosis and does not reattach, the event is called

Accepted Answer

A)  nondisjunction. 
B)  translocation. 
C)  dysplasia. 
D)  nondysplasia. 
E)  a deletion. 
A)  nondisjunction. 
B)  translocation. 
C)  dysplasia. 
D)  nondysplasia. 
E)  a deletion.

Question 4

Match each of the following disorders to the genotype with which it is associated.
-one X chromosome; no Y or additional X chromosome

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 5

Mendel's law of independent assortment states that genes separate from each other during gamete formation so that each sperm or egg gets only one unit of each pair.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following human traits is an example of codominance?

Accepted Answer

A)  sickle-cell anemia 
B)  variation in eye color 
C)  human height 
D)  AB blood type 
E)  both sickle-cell anemia and AB blood type 
A)  sickle-cell anemia 
B)  variation in eye color 
C)  human height 
D)  AB blood type 
E)  both sickle-cell anemia and AB blood type

Question 7

Cystic fibrosis is the most common fatal genetic disease in North America and results in what type of allele located on chromosome 7?

Accepted Answer

A)  recessive 
B)  dominant 
C)  homozygous 
D)  heterozygous 
E)  polygenic 
A)  recessive 
B)  dominant 
C)  homozygous 
D)  heterozygous 
E)  polygenic

Question 8

Explain why in some cases, linked genes may be separated during crossing-over, yet at other times, linked genes are not affected by the recombination during meiosis.

Accepted Answer

Linked genes are different genes located

Question 9

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."
-Cystic fibrosis is a genetic disorder that results from the inheritance of two recessive alleles. What is the chance that a child will inherit the disorder if one parent is heterozygous for this gene and one parent has cystic fibrosis?

Accepted Answer

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

Question 10

Identify the mode of inheritance for each of the following traits.
-AB blood type

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 11

Genes located on the same chromosome are not always inherited together because of the process of ________, which occurs during meiosis; this process "reshuffles" the genes.

Accepted Answer

The answer of Genes located on the same chromosome are...

Question 12

Identify the mode of inheritance for each of the following traits.
-baldness

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 13

An example of a genotype is

Accepted Answer

A)  attached earlobes. 
B)  homozygous dominant. 
C)  brown hair color. 
D)  long fingers. 
E)  blood type AB. 
A)  attached earlobes. 
B)  homozygous dominant. 
C)  brown hair color. 
D)  long fingers. 
E)  blood type AB.

Question 14

Identify the mode of inheritance for each of the following traits.
-Down syndrome

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 15

Which one of the following syndromes results in an individual with a nearly normal female phenotype and a tendency to develop mild mental retardation?

Accepted Answer

A)  Trisomy-X syndrome 
B)  Klinefelter syndrome 
C)  Double-Y syndrome 
D)  Turner syndrome 
E)  Trisomy-Y syndrome 
A)  Trisomy-X syndrome 
B)  Klinefelter syndrome 
C)  Double-Y syndrome 
D)  Turner syndrome 
E)  Trisomy-Y syndrome

Question 16

A Punnett square can be used to determine possible phenotypic ratios of offspring given a particular combination of parental alleles.

Accepted Answer

A) True 
 B)False

Question 17

Alternative versions of the same gene are ________.

Accepted Answer

The answer of Alternative versions of the same gene are...

Question 18

The process by which a piece of a chromosome breaks off and then attaches to another chromosome is referred to as ________.

Accepted Answer

The answer of The process by which a piece of...

Question 19

The Punnett square is a useful tool for

Accepted Answer

A)  determining the rate of segregation of alleles. 
B)  calculating how many mutations occur during DNA replication. 
C)  determining which genes or traits assort independently during gamete formation. 
D)  predicting the ratios of possible genotypes of a particular combination of alleles. 
E)  predicting the level of crossing over that will occur during meiosis. 
A)  determining the rate of segregation of alleles. 
B)  calculating how many mutations occur during DNA replication. 
C)  determining which genes or traits assort independently during gamete formation. 
D)  predicting the ratios of possible genotypes of a particular combination of alleles. 
E)  predicting the level of crossing over that will occur during meiosis.

Question 20

The trend toward increased height and weight due to improved nutrition in certain human populations is an example of the effect of ________ on phenotypes.

Accepted Answer

A)  gene linkage 
B)  the environment 
C)  codominance 
D)  polygenic inheritance 
E)  genetic disorders 
A)  gene linkage 
B)  the environment 
C)  codominance 
D)  polygenic inheritance 
E)  genetic disorders

Exam 19: Genetics and Inheritance

Failure of sister chromatids to separate properly is called

Match each of the following disorders to the genotype with which it is associated. -trisomy 18

If a piece of chromosome breaks off during mitosis or meiosis and does not reattach, the event is called

Match each of the following disorders to the genotype with which it is associated. -one X chromosome; no Y or additional X chromosome

Mendel's law of independent assortment states that genes separate from each other during gamete formation so that each sperm or egg gets only one unit of each pair.

Which of the following human traits is an example of codominance?

Cystic fibrosis is the most common fatal genetic disease in North America and results in what type of allele located on chromosome 7?

Explain why in some cases, linked genes may be separated during crossing-over, yet at other times, linked genes are not affected by the recombination during meiosis.

Identify the mode of inheritance for each of the following traits. -AB blood type

Genes located on the same chromosome are not always inherited together because of the process of ________, which occurs during meiosis; this process "reshuffles" the genes.

Identify the mode of inheritance for each of the following traits. -baldness

An example of a genotype is

Identify the mode of inheritance for each of the following traits. -Down syndrome

Which one of the following syndromes results in an individual with a nearly normal female phenotype and a tendency to develop mild mental retardation?

A Punnett square can be used to determine possible phenotypic ratios of offspring given a particular combination of parental alleles.

Alternative versions of the same gene are ________.

The process by which a piece of a chromosome breaks off and then attaches to another chromosome is referred to as ________.

The Punnett square is a useful tool for

The trend toward increased height and weight due to improved nutrition in certain human populations is an example of the effect of ________ on phenotypes.

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