Question 1

Human diploid cells have

Accepted Answer

A)  23 pairs of chromosomes. 
B)  23 chromosomes. 
C)  46 pairs of chromosomes. 
D)  2 pairs of sex chromosomes. 
E)  1 pair of autosomes. 
A)  23 pairs of chromosomes. 
B)  23 chromosomes. 
C)  46 pairs of chromosomes. 
D)  2 pairs of sex chromosomes. 
E)  1 pair of autosomes.

Question 2

A zygote is

Accepted Answer

A)  a haploid cell. 
B)  a gamete. 
C)  a direct product of meiosis. 
D)  a diploid cell. 
E)  All answers are correct. 
A)  a haploid cell. 
B)  a gamete. 
C)  a direct product of meiosis. 
D)  a diploid cell. 
E)  All answers are correct.

Question 3

Genetic variability will not occur among offspring if crossing over does not occur during prophase I of meiosis.

Accepted Answer

A) True 
 B)False

Question 4

A cell having one or more complete sets of extra chromosomes

Accepted Answer

A)  cannot be produced by meiosis. 
B)  cannot participate in fertilization. 
C)  is polyploid. 
D)  is haploid. 
E)  is dizygotic. 
A)  cannot be produced by meiosis. 
B)  cannot participate in fertilization. 
C)  is polyploid. 
D)  is haploid. 
E)  is dizygotic.

Question 5

Nondisjunction may cause

Accepted Answer

A)  trisomy 21. 
B)  Turner syndrome. 
C)  Jacobs syndrome. 
D)  Klinefelter syndrome. 
E)  All answers are correct. 
A)  trisomy 21. 
B)  Turner syndrome. 
C)  Jacobs syndrome. 
D)  Klinefelter syndrome. 
E)  All answers are correct.

Question 6

Chromosomes that look alike and carry the same genes are

Accepted Answer

A)  the X and Y chromosome. 
B)  heterologous chromosomes. 
C)  homologous chromosomes. 
D)  found in females only. 
E)  found in males only. 
A)  the X and Y chromosome. 
B)  heterologous chromosomes. 
C)  homologous chromosomes. 
D)  found in females only. 
E)  found in males only.

Question 7

Meiosis generates genetic variability by crossing over of homologous chromosomes in haploid somatic cells.

Accepted Answer

A) True 
 B)False

Question 8

Genetic variability will not occur among offspring if random alignment does not occur during anaphase I of meiosis.

Accepted Answer

A) True 
 B)False

Question 9

When a diploid germ cell in a male goes through meiosis,it will generate

Accepted Answer

A)  two haploid cells. 
B)  four diploid cells. 
C)  two diploid cells. 
D)  four haploid cells. 
E)  This is not possible. 
A)  two haploid cells. 
B)  four diploid cells. 
C)  two diploid cells. 
D)  four haploid cells. 
E)  This is not possible.

Question 10

The Y chromosome

Accepted Answer

A)  is larger than the X chromosome. 
B)  contains more genes than the X chromosome. 
C)  is the same size as the X chromosome. 
D)  is smaller than the X chromosome. 
E)  is genetically identical to the X chromosome. 
A)  is larger than the X chromosome. 
B)  contains more genes than the X chromosome. 
C)  is the same size as the X chromosome. 
D)  is smaller than the X chromosome. 
E)  is genetically identical to the X chromosome.

Question 11

In meiosis,homologous chromosomes align next to one another during

Accepted Answer

A)  interphase I. 
B)  metaphase II. 
C)  prophase I. 
D)  metaphase I. 
E)  prophase II. 
A)  interphase I. 
B)  metaphase II. 
C)  prophase I. 
D)  metaphase I. 
E)  prophase II.

Question 12

Researchers exposed the microscopic roundworm, Caenorhabditis elegans,to disease causing bacteria.The roundworm can reproduce either asexually or sexually. In the presence of live bacteria,more roundworms reproduced sexually,and the resulting offspring were

Accepted Answer

A)  unique, giving the roundworms a better chance of survival. 
B)  identical, giving the roundworms a better chance for survival. 
C)  identical, giving the bacteria a greater chance to kill the entire round worm population. 
D)  unique, giving the roundworms a more energy-conserving type of reproduction. 
E)  All of the answer choices are correct. 
A)  unique, giving the roundworms a better chance of survival. 
B)  identical, giving the roundworms a better chance for survival. 
C)  identical, giving the bacteria a greater chance to kill the entire round worm population. 
D)  unique, giving the roundworms a more energy-conserving type of reproduction. 
E)  All of the answer choices are correct.

Question 13

A diploid germ cell will produce cells with half the number of chromosomes,haploid cells,in

Accepted Answer

A)  fertilization. 
B)  mitosis. 
C)  meiosis. 
D)  replication. 
E)  mutation. 
A)  fertilization. 
B)  mitosis. 
C)  meiosis. 
D)  replication. 
E)  mutation.

Question 14

The process by which homologous chromosomes exchange genetic material

Accepted Answer

A)  is crossing over. 
B)  is random fertilization. 
C)  occurs only in bacteria. 
D)  occurs only in animals. 
E)  is independent assortment. 
A)  is crossing over. 
B)  is random fertilization. 
C)  occurs only in bacteria. 
D)  occurs only in animals. 
E)  is independent assortment.

Question 15

Identical twins result from a single fertilization to form a zygote,which then splits in half.

Accepted Answer

A) True 
 B)False

Question 16

If a diploid cell goes through mitosis it will generate

Accepted Answer

A)  four haploid cells. 
B)  two diploid cells. 
C)  two haploid cells. 
D)  four diploid cells. 
E)  This is not possible. 
A)  four haploid cells. 
B)  two diploid cells. 
C)  two haploid cells. 
D)  four diploid cells. 
E)  This is not possible.

Question 17

The chromosomal designation for a human female is

Accepted Answer

A)  XYY. 
B)  XY. 
C)  YY. 
D)  XX. 
E)  No answer is correct. 
A)  XYY. 
B)  XY. 
C)  YY. 
D)  XX. 
E)  No answer is correct.

Question 18

Mitosis occurs in somatic cells throughout life.

Accepted Answer

A) True 
 B)False

Exam 9: Sexual Reproduction and Meiosis

Human diploid cells have

A zygote is

Genetic variability will not occur among offspring if crossing over does not occur during prophase I of meiosis.

A cell having one or more complete sets of extra chromosomes

Nondisjunction may cause

Chromosomes that look alike and carry the same genes are

Meiosis generates genetic variability by crossing over of homologous chromosomes in haploid somatic cells.

Genetic variability will not occur among offspring if random alignment does not occur during anaphase I of meiosis.

When a diploid germ cell in a male goes through meiosis,it will generate

The Y chromosome

In meiosis,homologous chromosomes align next to one another during

Researchers exposed the microscopic roundworm, Caenorhabditis elegans,to disease causing bacteria.The roundworm can reproduce either asexually or sexually. In the presence of live bacteria,more roundworms reproduced sexually,and the resulting offspring were

A diploid germ cell will produce cells with half the number of chromosomes,haploid cells,in

The process by which homologous chromosomes exchange genetic material

Identical twins result from a single fertilization to form a zygote,which then splits in half.

If a diploid cell goes through mitosis it will generate

The chromosomal designation for a human female is

Mitosis occurs in somatic cells throughout life.

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