Question 1

A person normally has two alleles of a gene because

Accepted Answer

A)   DNA only comes in two forms.
B)   one allele of a gene is carried on each of two homologous chromosomes.
C)   there isn't enough DNA to accommodate more than this.
D)   all genes come in only two varieties.E) A) and C)
F) All of the above

Question 2

A gene typically has many alleles because

Accepted Answer

A)   humans have many traits.
B)   a chromosome has many genes.
C)   a DNA sequence can vary in many ways.
D)   a protein sequence can vary in many ways.E) C) and D)
F) A) and C)

Question 3

Gene expression profiling catalogues the mutations in a cell.

Accepted Answer

A) True 
 B)False

Question 4

An allele that masks the effect of another is

Accepted Answer

A)   homozygous.
B)   heterozygous.
C)   recessive.
D)   dominant.E) B) and D)
F) None of the above

Question 5

A trait determined by more than one gene is polygenic.

Accepted Answer

A) True 
 B)False

Question 6

In a simple dominant-recessive inheritance pattern, what percentage of the offspring would exhibit the dominant trait if one parent is heterozygous and the other is homozygous recessive?

Accepted Answer

A)   25%
B)   50%
C)   75%
D)   100%E) A) and B)
F) B) and C)

Question 7

Ultrasound and maternal serum marker tests are less informative than amniocentesis or chorionic villus sampling (CVS)  in diagnosing trisomy 21 because

Accepted Answer

A)   ultrasound and maternal serum markers check chromosomes, and CVS and amniocentesis do not.
B)   ultrasound and maternal serum markers do not check chromosomes, and CVS and amniocentesis do.
C)   maternal serum markers and amniocentesis check chromosomes, and ultrasound and CVS do not.
D)   ultrasound and CVS check chromosomes, and maternal serum markers and amniocentesis do not.E) C) and D)
F) A) and C)

Question 8

A human cell with 46 chromosomes is

Accepted Answer

A)   aneuploid.
B)   euploid.
C)   polyploid.
D)   haploid.E) A) and D)
F) All of the above

Exam 24: Genetics and Genomics

Ultrasound and maternal serum marker tests are less informative than amniocentesis or chorionic villus sampling (CVS) in diagnosing trisomy 21 because

Correct Answer
verified

A human cell with 46 chromosomes is

Correct Answer
verified

Gene expression profiling catalogues the mutations in a cell.

Correct Answer
verified

A trait determined by more than one gene is polygenic.

Correct Answer
verified

A person normally has two alleles of a gene because

Correct Answer
verified

An allele that masks the effect of another is

Correct Answer
verified

In a simple dominant-recessive inheritance pattern, what percentage of the offspring would exhibit the dominant trait if one parent is heterozygous and the other is homozygous recessive?

Correct Answer
verified

A gene typically has many alleles because

Correct Answer
verified

Exam 24: Genetics and Genomics

Ultrasound and maternal serum marker tests are less informative than amniocentesis or chorionic villus sampling (CVS) in diagnosing trisomy 21 because

Correct AnswerverifiedShow Answer

A human cell with 46 chromosomes is

Correct AnswerverifiedShow Answer

Gene expression profiling catalogues the mutations in a cell.

Correct AnswerverifiedShow Answer

A trait determined by more than one gene is polygenic.

Correct AnswerverifiedShow Answer

A person normally has two alleles of a gene because

Correct AnswerverifiedShow Answer

An allele that masks the effect of another is

Correct AnswerverifiedShow Answer

In a simple dominant-recessive inheritance pattern, what percentage of the offspring would exhibit the dominant trait if one parent is heterozygous and the other is homozygous recessive?

Correct AnswerverifiedShow Answer

A gene typically has many alleles because

Correct AnswerverifiedShow Answer

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verified

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