Question 1

Some disease conditions, such as trisomy, always require the combined effects of inheritance and environmental factors.

Accepted Answer

A) True 
 B)False

Question 2

An individual possessing the sex chromosome combination "XY" is genetically:

Accepted Answer

A)   a male.
B)   a female.
C)   both.
D)   neither.

Question 3

The hypothesis regarding tumor suppressor genes states that these genes:

Accepted Answer

A)   can transform a cell into a cancer cell only when certain environmental conditions occur.
B)   regulate cell division so that it proceeds normally.
C)   govern the cell's ability to repair damaged DNA.
D)   Both A and C are correct.

Question 4

A person with heterozygous sex chromosomes is a female.

Accepted Answer

A) True 
 B)False

Question 5

Each offspring from a single set of parents is likely to be genetically unique.

Accepted Answer

A) True 
 B)False

Question 6

The Y chromosome is larger than the X chromosome.

Accepted Answer

A) True 
 B)False

Question 7

The condition called trisomy results from a(n) :

Accepted Answer

A)   mistake in mitosis called nondisjunction.
B)   mistake in meiosis called nondisjunction.
C)   abnormality in a single gene.
D)   genetic predisposition.

Question 8

A sperm containing a Y chromosome swims faster than a sperm containing an X chromosome.

Accepted Answer

A) True 
 B)False  True

Question 9

The inheritance of a genetic risk factor is not sufficient to cause a disease.

Accepted Answer

A) True 
 B)False

Question 10

Match each of the terms with its corresponding definition.
-The scientific study of inheritance

Accepted Answer

A)  Recessive
B)  Codominance
C)  Monosomy
D)  Autosome
E)  KaryotypeF) Sex-linked traitG) DominantH) TrisomyI) Punnett squareJ) GenomeK) Sex chromosomeL) HeterozygousM) HomozygousN) Genetics

Question 11

The chromosome that has the fewest genes contains only 200 genes and is called:

Accepted Answer

A)   chromosome 1.
B)   chromosome 7.
C)   Y chromosome.
D)   X chromosome.

Question 12

Which of the following is not a type of RNA?

Accepted Answer

A)   Mitochondrial RNA
B)   Ribosomal RNA
C)   Transfer RNA
D)   All of the above are types of RNA.

Question 13

The chromosome with the fewest number of genes is carried by about only half the population.

Accepted Answer

A) True 
 B)False

Question 14

Exons are removed from transcribed RNA to form the functional mRNA strand.

Accepted Answer

A) True 
 B)False  False

Question 15

Carriers of Tay-Sachs disease have a higher resistance to:

Accepted Answer

A)   malaria.
B)   tuberculosis.
C)   cholera.
D)   the toxic effects of mold growing on grain.

Question 16

Red-green color blindness shows X-linked recessive inheritance. Assume "X" is normal, "X1" is recessive for the trait, and "Y" is normal. Then, an individual with the genotype "XX1" will be a:

Accepted Answer

A)   normal female and a carrier.
B)   color-blind male.
C)   normal female and not a carrier.
D)   normal male.

Question 17

In human blood type, types A and B are codominant, producing type AB. They are both dominant to the recessive O type. Which of the following parental genotypes could produce a child with type O blood?

Accepted Answer

A)   AB x AO
B)   AO x BO
C)   AO x BB
D)   None of the above genotypes can produce a type O offspring. B

Question 18

Which of the following statements is not true of mitochondrial DNA?

Accepted Answer

A)   The DNA is in the form of a circle.
B)   The usual "stop" code in nuclear DNA codes for an amino acid in mitochondrial DNA.
C)   The mitochondrial DNA in the zygote comes only from the mother.
D)   All of the above statements are true of mitochondrial DNA.

Question 19

Mitochondrial inheritance is known to transmit genes for several degenerative nerve and muscle disorders.

Accepted Answer

A) True 
 B)False

Question 20

A mutagen causes a change in the genetic code.

Accepted Answer

A) True 
 B)False

Exam 48: Genetics and Heredity

Some disease conditions, such as trisomy, always require the combined effects of inheritance and environmental factors.

Correct AnswerverifiedShow Answer

An individual possessing the sex chromosome combination "XY" is genetically:

Correct AnswerverifiedShow Answer

The hypothesis regarding tumor suppressor genes states that these genes:

Correct AnswerverifiedShow Answer

A person with heterozygous sex chromosomes is a female.

Correct AnswerverifiedShow Answer

Each offspring from a single set of parents is likely to be genetically unique.

Correct AnswerverifiedShow Answer

The Y chromosome is larger than the X chromosome.

Correct AnswerverifiedShow Answer

The condition called trisomy results from a(n) :

Correct AnswerverifiedShow Answer

A sperm containing a Y chromosome swims faster than a sperm containing an X chromosome.

Correct AnswerverifiedTrue

The inheritance of a genetic risk factor is not sufficient to cause a disease.

Correct AnswerverifiedShow Answer

Match each of the terms with its corresponding definition. -The scientific study of inheritance

Correct AnswerverifiedShow Answer

The chromosome that has the fewest genes contains only 200 genes and is called:

Correct AnswerverifiedShow Answer

Which of the following is not a type of RNA?

Correct AnswerverifiedShow Answer

The chromosome with the fewest number of genes is carried by about only half the population.

Correct AnswerverifiedShow Answer

Exons are removed from transcribed RNA to form the functional mRNA strand.

Correct AnswerverifiedFalse

Carriers of Tay-Sachs disease have a higher resistance to:

Correct AnswerverifiedShow Answer

Red-green color blindness shows X-linked recessive inheritance. Assume "X" is normal, "X1" is recessive for the trait, and "Y" is normal. Then, an individual with the genotype "XX1" will be a:

Correct AnswerverifiedShow Answer

In human blood type, types A and B are codominant, producing type AB. They are both dominant to the recessive O type. Which of the following parental genotypes could produce a child with type O blood?

Correct AnswerverifiedB

Which of the following statements is not true of mitochondrial DNA?

Correct AnswerverifiedShow Answer

Mitochondrial inheritance is known to transmit genes for several degenerative nerve and muscle disorders.

Correct AnswerverifiedShow Answer

A mutagen causes a change in the genetic code.

Correct AnswerverifiedShow Answer

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True

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False

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B

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