Question 1

All of the following are TRUE of meiosis,EXCEPT

Accepted Answer

A)  recombination occurs during meiosis II. 
B)  the resulting cells contain 23 chromosomes. 
C)  there are two cell divisions. 
D)  one cell produces four cells. 
E)  homologous pairs separate during meiosis I. 
A)  recombination occurs during meiosis II. 
B)  the resulting cells contain 23 chromosomes. 
C)  there are two cell divisions. 
D)  one cell produces four cells. 
E)  homologous pairs separate during meiosis I. A

Question 2

People with the same cystic fibrosis alleles at the CFTR site do not always exhibit the same symptoms-some are sicker than others.Which of the following best explains this?

Accepted Answer

A)  the influence of modifier genes 
B)  the influence of deletion genes 
C)  the presence of other genes that code for normal CFTR protein 
D)  the presence of another gene that fixes the deformed protein 
E)  worse symptoms in men than in women 
A)  the influence of modifier genes 
B)  the influence of deletion genes 
C)  the presence of other genes that code for normal CFTR protein 
D)  the presence of another gene that fixes the deformed protein 
E)  worse symptoms in men than in women A

Question 3

What phenotypic ratio of the progeny results from independent assortment of two traits when parents are heterozygous for both traits?

Accepted Answer

A)  4:1 
B)  3:1 
C)  9:3:3:1 
D)  3:6:6:1 
E)  12:3:1 
A)  4:1 
B)  3:1 
C)  9:3:3:1 
D)  3:6:6:1 
E)  12:3:1 C

Question 4

Where is the CFTR protein found?

Accepted Answer

A)  in cells lining the lungs 
B)  in skeletal cells 
C)  in every cell in the body 
D)  in muscle cells 
E)  in heart cells 
A)  in cells lining the lungs 
B)  in skeletal cells 
C)  in every cell in the body 
D)  in muscle cells 
E)  in heart cells

Question 5

Which statement is true of a single human gamete?

Accepted Answer

A)  There are 46 chromosomes present. 
B)  There are two alleles per trait on each chromosome. 
C)  There is one allele per trait on each chromosome. 
D)  all of these 
E)  none of these 
A)  There are 46 chromosomes present. 
B)  There are two alleles per trait on each chromosome. 
C)  There is one allele per trait on each chromosome. 
D)  all of these 
E)  none of these

Question 6

One parent has one copy of a dominant allele for gene 87 and one recessive allele for Gene 87.The other parent has two copies of the recessive allele for Gene 87.What is the chance that their children will inherit the recessive condition (two copies of Gene 87)? You may need to draw a Punnett square to figure this out.

Accepted Answer

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

Question 7

Sexual reproductive cells are called

Accepted Answer

A)  sporozoites. 
B)  lymphocytes. 
C)  zygotes. 
D)  gametes. 
E)  conidia. 
A)  sporozoites. 
B)  lymphocytes. 
C)  zygotes. 
D)  gametes. 
E)  conidia.

Question 8

Medical treatment for a patient with cystic fibrosis involves

Accepted Answer

A)  a vibrating vest. 
B)  inhalation of a salt solution. 
C)  early diagnosis. 
D)  antibiotics. 
E)  All of the above. 
A)  a vibrating vest. 
B)  inhalation of a salt solution. 
C)  early diagnosis. 
D)  antibiotics. 
E)  All of the above.

Question 9

All of the following are true of mutations,EXCEPT

Accepted Answer

A)  they lead to new alleles. 
B)  they are a source of genetic variation. 
C)  they are sometimes harmful. 
D)  they are sometimes helpful. 
E)  mutations always lead to the organism's death. 
A)  they lead to new alleles. 
B)  they are a source of genetic variation. 
C)  they are sometimes harmful. 
D)  they are sometimes helpful. 
E)  mutations always lead to the organism's death.

Question 10

Which describes a genotype homozygous dominant for a single trait?

Accepted Answer

A)  AAaa 
B)  AABB 
C)  AA 
D)  Aa 
E)  aa 
A)  AAaa 
B)  AABB 
C)  AA 
D)  Aa 
E)  aa

Question 11

What is the significance of gene mutations in terms of protein function and clinical outcome?

Accepted Answer

A)  Changes in gene sequence can alter the shape or function of a protein. 
B)  Analyzing specific mutations allows researchers to study overall gene function. 
C)  Gene mutations allow researchers to identify deficient proteins and aid in therapeutic intervention,such as in cystic fibrosis. 
D)  A and B. 
E)  All of the above. 
A)  Changes in gene sequence can alter the shape or function of a protein. 
B)  Analyzing specific mutations allows researchers to study overall gene function. 
C)  Gene mutations allow researchers to identify deficient proteins and aid in therapeutic intervention,such as in cystic fibrosis. 
D)  A and B. 
E)  All of the above.

Question 12

What is the genotype of a person with cystic fibrosis?

Accepted Answer

A)  The genotype includes two mutant CFTR genes,one each on the homologous chromosomes for chromosome 7. 
B)  The genotype includes one mutant CFTR gene and one normal gene,one each on the homologous chromosomes for chromosome 7. 
C)  The genotype includes two mutant CFTR genes,both on a single homologous chromosome 7;the other homologous chromosome 7 is normal. 
D)  The genotype includes only one homologous chromosome 7;the second chromosome 7 is missing. 
E)  The genotype includes 2 additional chromosomes with the mutant CFTR gene,making a total of 25 chromosomes. 
A)  The genotype includes two mutant CFTR genes,one each on the homologous chromosomes for chromosome 7. 
B)  The genotype includes one mutant CFTR gene and one normal gene,one each on the homologous chromosomes for chromosome 7. 
C)  The genotype includes two mutant CFTR genes,both on a single homologous chromosome 7;the other homologous chromosome 7 is normal. 
D)  The genotype includes only one homologous chromosome 7;the second chromosome 7 is missing. 
E)  The genotype includes 2 additional chromosomes with the mutant CFTR gene,making a total of 25 chromosomes.

Question 13

In humans,which process increases genetic diversity the most?

Accepted Answer

A)  mutations 
B)  linkage 
C)  recombination 
D)  independent assortment 
E)  gamete fusion 
A)  mutations 
B)  linkage 
C)  recombination 
D)  independent assortment 
E)  gamete fusion

Question 14

Crossing over occurs between

Accepted Answer

A)  maternal chromosomes. 
B)  sister chromatids. 
C)  nonsister chromatids. 
D)  paternal chromosomes. 
E)  homologous chromosomes. 
A)  maternal chromosomes. 
B)  sister chromatids. 
C)  nonsister chromatids. 
D)  paternal chromosomes. 
E)  homologous chromosomes.

Question 15

A phenotype is

Accepted Answer

A)  an inherited disorder. 
B)  a physical trait. 
C)  a genetic trait. 
D)  an allele descriptor. 
E)  a karyotype. 
A)  an inherited disorder. 
B)  a physical trait. 
C)  a genetic trait. 
D)  an allele descriptor. 
E)  a karyotype.

Question 16

What percentage of a man's chromosomes are found in a single sperm cell?

Accepted Answer

A)  25% 
B)  75% 
C)  100% 
D)  33.3% 
E)  50% 
A)  25% 
B)  75% 
C)  100% 
D)  33.3% 
E)  50%

Question 17

The deletion of a codon in the gene for CF causes the CFTR protein to

Accepted Answer

A)  stop being made. 
B)  become nonfunctional. 
C)  become more active. 
D)  become overexpressed. 
E)  become underexpressed. 
A)  stop being made. 
B)  become nonfunctional. 
C)  become more active. 
D)  become overexpressed. 
E)  become underexpressed.

Question 18

An alien has 82 total chromosomes in each of its body cells.The chromosomes are paired,making 41 pairs.If the alien's gametes undergo meiosis,what are the number and arrangement (paired or not)of chromosomes in one of its gametes?

Accepted Answer

A)  41 paired chromosomes 
B)  41 unpaired chromosomes 
C)  82 unpaired chromosomes 
D)  82 paired chromosomes 
E)  164 paired chromosomes 
A)  41 paired chromosomes 
B)  41 unpaired chromosomes 
C)  82 unpaired chromosomes 
D)  82 paired chromosomes 
E)  164 paired chromosomes

Question 19

Two healthy individuals have a child who has Huntington disease,an autosomal dominant disease.How did this happen?

Accepted Answer

A)  The mother had two recessive alleles. 
B)  The mother had one recessive allele and one normal allele,and the father had two normal alleles. 
C)  The mother had two normal alleles,and the father had one recessive and one normal allele. 
D)  Each parent had one normal and one recessive allele. 
E)  The condition could not have been inherited from these two parents. 
A)  The mother had two recessive alleles. 
B)  The mother had one recessive allele and one normal allele,and the father had two normal alleles. 
C)  The mother had two normal alleles,and the father had one recessive and one normal allele. 
D)  Each parent had one normal and one recessive allele. 
E)  The condition could not have been inherited from these two parents.

Question 20

Which of the following statements is FALSE?

Accepted Answer

A)  Homologous chromosomes have the same types of genes as each other. 
B)  Homologous chromosomes might have the exact same alleles as each other. 
C)  Homologous chromosomes are assigned the same chromosome number. 
D)  The sizes of homologous chromosomes are very similar or identical. 
E)  Homologous chromosomes must have the exact same alleles as each other. 
A)  Homologous chromosomes have the same types of genes as each other. 
B)  Homologous chromosomes might have the exact same alleles as each other. 
C)  Homologous chromosomes are assigned the same chromosome number. 
D)  The sizes of homologous chromosomes are very similar or identical. 
E)  Homologous chromosomes must have the exact same alleles as each other.

Exam 11: Simple Inheritance and Meiosis

All of the following are TRUE of meiosis,EXCEPT

People with the same cystic fibrosis alleles at the CFTR site do not always exhibit the same symptoms-some are sicker than others.Which of the following best explains this?

What phenotypic ratio of the progeny results from independent assortment of two traits when parents are heterozygous for both traits?

Where is the CFTR protein found?

Which statement is true of a single human gamete?

Sexual reproductive cells are called

Medical treatment for a patient with cystic fibrosis involves

All of the following are true of mutations,EXCEPT

Which describes a genotype homozygous dominant for a single trait?

What is the significance of gene mutations in terms of protein function and clinical outcome?

What is the genotype of a person with cystic fibrosis?

In humans,which process increases genetic diversity the most?

Crossing over occurs between

A phenotype is

What percentage of a man's chromosomes are found in a single sperm cell?

The deletion of a codon in the gene for CF causes the CFTR protein to

An alien has 82 total chromosomes in each of its body cells.The chromosomes are paired,making 41 pairs.If the alien's gametes undergo meiosis,what are the number and arrangement (paired or not)of chromosomes in one of its gametes?

Two healthy individuals have a child who has Huntington disease,an autosomal dominant disease.How did this happen?

Which of the following statements is FALSE?

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