Question 1

Janet is homozygous dominant for the wild type allele of the gene that when mutant causes cystic fibrosis.Her brother Henry is a heterozygote.They both do not have the disease cystic fibrosis.

Accepted Answer

A) True 
 B)False

Question 2

Most of the DNA in the human genome encodes protein.

Accepted Answer

A) True 
 B)False

Question 3

The human genome consists of

Accepted Answer

A)  DNA,most of which encodes protein.
B)  DNA,most of which does not encode protein.
C)  protein,most of which encodes DNA.
D)  protein,most of which does not encode DNA.E) A) and B)
F) A) and C)

Question 4

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) A) and B)
F) None of the above

Question 5

The genotypes and phenotypes that result from the cross of Aa and Aa (A = normal pigmentation and a = albinism) are

Accepted Answer

A)  phenotypes-75% normal and 25% albino;genotypes-25% homozygous dominant and 50% heterozygous and 25% homozygous recessive.
B)  phenotypes-50% normal and 50% albino;genotypes-all homozygous recessive.
C)  phenotypes-50% normal and 50% albino;genotypes-50% homozygous recessive and 50% homozygous dominant.
D)  phenotypes-25% normal and 75% albino;genotypes-25% homozygous dominant and 50% heterozygous and 25% homozygous recessive.E) B) and C)
F) B) and D)

Question 6

The nuances of eye color arise from

Accepted Answer

A)  the numbers of rods and cones in the retinA.
B)  the way pigments are deposited in the iris.
C)  how much vitamin A is in a person's diet.
D)  multiple alleles of at least 10 genes.E) A) and B)
F) C) and D)

Question 7

An allele that is not expressed in the heterozygous condition is

Accepted Answer

A)  recessive.
B)  dominant.
C)  autosomal.
D)  codominant.E) C) and D)
F) B) and D)

Question 8

Gender determination for males reflects expression of

Accepted Answer

A)  the SRY gene but not the Wnt4 gene.
B)  the Wnt4 gene but not the SRY gene.
C)  both the SRY and Wnt4 genes.
D)  the entire Y chromosome.E) A) and B)
F) All of the above

Question 9

A pharmacogenetic test can reveal whether a certain drug will be effective and/or cause adverse effects in a particular person.

Accepted Answer

A) True 
 B)False

Question 10

Polydactyly is an example of a trait that is both ___________ and variably expressive.

Accepted Answer

A)  incompletely penetrant
B)  pleiotropic
C)  multifactorial
D)  completely penetrantE) A) and C)
F) C) and D)

Question 11

The genotypes and phenotypes that result from a cross of AA and Aa (A = normal pigmentation and a = albinism) are

Accepted Answer

A)  phenotypes-all normal;genotypes-50% homozygous dominant and 50% heterozygous.
B)  phenotypes-50% normal and 50% albino;genotypes-all heterozygous.
C)  phenotypes-75% norma and 25% albino;genotypes-75% heterozygous and 25% homozygous.
D)  phenotypes-all albino;genotypes-50% heterozygous and 50% homozygous recessive.E) None of the above
F) A) and B)

Question 12

The human genome contains millions of different genes.

Accepted Answer

A) True 
 B)False

Question 13

The two general types of chromosomes are

Accepted Answer

A)  autosomes and allosomes.
B)  sex chromosomes and allosomes.
C)  sex chromosomes and autosomes.
D)  X and Y chromosomes.E) All of the above
F) B) and C)

Question 14

A trait determined by more than one gene is polygenic.

Accepted Answer

A) True 
 B)False

Question 15

Gametes pass genetic information from generation to generation.

Accepted Answer

A) True 
 B)False

Question 16

Genes have multiple alleles that differ in DNA sequence because a gene consists of many nucleotides,each of which can be any of four types.

Accepted Answer

A) True 
 B)False

Question 17

An allele that masks the effect of another is

Accepted Answer

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

Question 18

The field of genetics deals only with disease.

Accepted Answer

A) True 
 B)False

Question 19

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) C) and D)
F) A) and B)

Question 20

Hemophilia A is

Accepted Answer

A)  due to an X-linked dominant gene.
B)  passed from affected males to their sons.
C)  more common in females.
D)  a defect in the clotting mechanism.E) B) and D)
F) None of the above

Exam 24: Genetics and Genomics

An allele that masks the effect of another is

Correct AnswerverifiedShow Answer

The genotypes and phenotypes that result from a cross of AA and Aa (A = normal pigmentation and a = albinism) are

Correct AnswerverifiedShow Answer

A trait determined by more than one gene is polygenic.

Correct AnswerverifiedShow Answer

Genes have multiple alleles that differ in DNA sequence because a gene consists of many nucleotides,each of which can be any of four types.

Correct AnswerverifiedShow Answer

Polydactyly is an example of a trait that is both ___________ and variably expressive.

Correct AnswerverifiedShow Answer

Janet is homozygous dominant for the wild type allele of the gene that when mutant causes cystic fibrosis.Her brother Henry is a heterozygote.They both do not have the disease cystic fibrosis.

Correct AnswerverifiedShow Answer

An allele that is not expressed in the heterozygous condition is

Correct AnswerverifiedShow Answer

The two general types of chromosomes are

Correct AnswerverifiedShow Answer

A person normally has two alleles of a gene because

Correct AnswerverifiedShow Answer

The human genome consists of

Correct AnswerverifiedShow Answer

Most of the DNA in the human genome encodes protein.

Correct AnswerverifiedShow Answer

A pharmacogenetic test can reveal whether a certain drug will be effective and/or cause adverse effects in a particular person.

Correct AnswerverifiedShow Answer

A gene typically has many alleles because

Correct AnswerverifiedShow Answer

Hemophilia A is

Correct AnswerverifiedShow Answer

The field of genetics deals only with disease.

Correct AnswerverifiedShow Answer

The nuances of eye color arise from

Correct AnswerverifiedShow Answer

The genotypes and phenotypes that result from the cross of Aa and Aa (A = normal pigmentation and a = albinism) are

Correct AnswerverifiedShow Answer

Gender determination for males reflects expression of

Correct AnswerverifiedShow Answer

The human genome contains millions of different genes.

Correct AnswerverifiedShow Answer

Gametes pass genetic information from generation to generation.

Correct AnswerverifiedShow Answer

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