Question 1

When does a chromosome go from one chromatid to two sister chromatids?

Accepted Answer

A)  during the G1 phase of interphase 
B)  during the S phase of interphase 
C)  during the G2 phase of interphase 
D)  during mitosis 
E)  during cytokinesis 
A)  during the G1 phase of interphase 
B)  during the S phase of interphase 
C)  during the G2 phase of interphase 
D)  during mitosis 
E)  during cytokinesis

Question 2

What is the structure that holds the chromatids together?

Accepted Answer

A)  centromere 
B)  chromatin 
C)  chromosomes 
D)  karyotype 
E)  none of these 
A)  centromere 
B)  chromatin 
C)  chromosomes 
D)  karyotype 
E)  none of these

Question 3

If nondisjunction occurs during meiosis II (to one of the cells resulting from meiosis I),how many of the final four products will be abnormal?

Accepted Answer

A)  two 
B)  four 
C)  none 
D)  one 
E)  three 
A)  two 
B)  four 
C)  none 
D)  one 
E)  three

Question 4

How many cells are produced as the result of meiosis and mitosis?

Accepted Answer

A)  four, two 
B)  two, two 
C)  two, four 
D)  four, four 
E)  it varies each time the cells go through meiosis and mitosis 
A)  four, two 
B)  two, two 
C)  two, four 
D)  four, four 
E)  it varies each time the cells go through meiosis and mitosis

Question 5

What structure is not divided during cytokinesis?

Accepted Answer

A)  chromosome 
B)  cell membrane 
C)  cell wall 
D)  cytoplasm 
E)  endoplasmic reticulum 
A)  chromosome 
B)  cell membrane 
C)  cell wall 
D)  cytoplasm 
E)  endoplasmic reticulum

Question 6

Which of the following syndromes has a karyotype with a missing X chromosome?

Accepted Answer

A)  Turner syndrome 
B)  Klinefelter syndrome 
C)  Jacobs syndrome 
D)  Down syndrome 
E)  Williams syndrome 
A)  Turner syndrome 
B)  Klinefelter syndrome 
C)  Jacobs syndrome 
D)  Down syndrome 
E)  Williams syndrome

Question 7

Which type of change in chromosome structure characterizes cri du chat syndrome?

Accepted Answer

A)  deletion 
B)  duplication 
C)  translocation 
D)  inversion 
E)  trisomy 
A)  deletion 
B)  duplication 
C)  translocation 
D)  inversion 
E)  trisomy

Question 8

Independent alignment creates genetic variation.This is associated with which stage of meiosis?

Accepted Answer

A)  prophase I 
B)  metaphase I 
C)  prophase II 
D)  metaphase II 
E)  anaphase II 
A)  prophase I 
B)  metaphase I 
C)  prophase II 
D)  metaphase II 
E)  anaphase II

Question 9

In a karyotype,the chromosomes are arranged in order from

Accepted Answer

A)  largest to smallest, with the sex chromosomes at the end. 
B)  smallest to largest, with the sex chromosomes at the end. 
C)  largest to smallest, including the sex chromosomes. 
D)  smallest to largest, including the sex chromosomes. 
E)  sex chromosomes first and then smallest to the largest. 
A)  largest to smallest, with the sex chromosomes at the end. 
B)  smallest to largest, with the sex chromosomes at the end. 
C)  largest to smallest, including the sex chromosomes. 
D)  smallest to largest, including the sex chromosomes. 
E)  sex chromosomes first and then smallest to the largest.

Question 10

How do proto-oncogenes affect the cell cycle?

Accepted Answer

A)  stimulate it 
B)  inhibit it 
C)  they do not affect the cell cycle 
D)  they cause it to temporarily pause and then rapidly accelerate 
E)  they rapidly accelerate it and then cause it to pause 
A)  stimulate it 
B)  inhibit it 
C)  they do not affect the cell cycle 
D)  they cause it to temporarily pause and then rapidly accelerate 
E)  they rapidly accelerate it and then cause it to pause

Question 11

In humans,how many of the chromosomes are autosomes?

Accepted Answer

A)  22 pairs 
B)  22 
C)  1 pair 
D)  46 
E)  23 pairs 
A)  22 pairs 
B)  22 
C)  1 pair 
D)  46 
E)  23 pairs

Question 12

Following mitosis,the daughter cells are identical to the parent cell.

Accepted Answer

A) True 
 B)False

Question 13

Sexual reproduction introduces more genetic variation than does asexual reproduction.

Accepted Answer

A) True 
 B)False

Question 14

In what way is spermatogenesis similar to oogenesis?

Accepted Answer

A)  Both occur continuously from puberty on. 
B)  Both result in four daughter cells. 
C)  Both result in cells with half the diploid chromosome number. 
D)  Both are arrested in prophase I. 
E)  Both result in one or two polar bodies. 
A)  Both occur continuously from puberty on. 
B)  Both result in four daughter cells. 
C)  Both result in cells with half the diploid chromosome number. 
D)  Both are arrested in prophase I. 
E)  Both result in one or two polar bodies.

Question 15

What happens at the G2 checkpoint?

Accepted Answer

A)  The cell makes a commitment to divide. 
B)  The cell receives external signals to divide. 
C)  The cell checks that the DNA has replicated. 
D)  The cell makes sure the chromosomes are lined up correctly. 
E)  The cell enters G0. 
A)  The cell makes a commitment to divide. 
B)  The cell receives external signals to divide. 
C)  The cell checks that the DNA has replicated. 
D)  The cell makes sure the chromosomes are lined up correctly. 
E)  The cell enters G0.

Question 16

List the stages of interphase and the events that occur during each of these stages.

Accepted Answer

G₁ stage: The cell grows and returns to n

Question 17

In a translocation,all of the DNA is present,and there is only one copy of each piece.

Accepted Answer

A) True 
 B)False

Question 18

All the products of oogenesis are equal in size and content.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following is not a stage of interphase?

Accepted Answer

A)  cytokinesis 
B)  G1 
C)  G2 
D)  S 
A)  cytokinesis 
B)  G1 
C)  G2 
D)  S

Question 20

In which stage of meiosis do homologous chromosomes separate from each other?

Accepted Answer

A)  metaphase I 
B)  metaphase II 
C)  anaphase I 
D)  anaphase II 
E)  interkinesis 
A)  metaphase I 
B)  metaphase II 
C)  anaphase I 
D)  anaphase II 
E)  interkinesis

Exam 19: Patterns of Chromosome Inheritance

When does a chromosome go from one chromatid to two sister chromatids?

What is the structure that holds the chromatids together?

If nondisjunction occurs during meiosis II (to one of the cells resulting from meiosis I),how many of the final four products will be abnormal?

How many cells are produced as the result of meiosis and mitosis?

What structure is not divided during cytokinesis?

Which of the following syndromes has a karyotype with a missing X chromosome?

Which type of change in chromosome structure characterizes cri du chat syndrome?

Independent alignment creates genetic variation.This is associated with which stage of meiosis?

In a karyotype,the chromosomes are arranged in order from

How do proto-oncogenes affect the cell cycle?

In humans,how many of the chromosomes are autosomes?

Following mitosis,the daughter cells are identical to the parent cell.

Sexual reproduction introduces more genetic variation than does asexual reproduction.

In what way is spermatogenesis similar to oogenesis?

What happens at the G2 checkpoint?

List the stages of interphase and the events that occur during each of these stages.

In a translocation,all of the DNA is present,and there is only one copy of each piece.

All the products of oogenesis are equal in size and content.

Which of the following is not a stage of interphase?

In which stage of meiosis do homologous chromosomes separate from each other?

Exploring Life and Science

Chemistry of Life

Cell Structure and Function

Organization and Regulation of Body Systems

Cardiovascular System: Heart and Blood Vessels

Cardiovascular System: Blood

The Lymphatic and Immune Systems

Infectious Diseases

Digestive System and Nutrition

Respiratory System

Urinary System

Skeletal System

Muscular System

Nervous System

Senses

Endocrine System

Reproductive System

Development and Aging

Cancer

Patterns of Genetic Inheritance

Dna Biology and Technology

Human Evolution

Ecology and the Nature of Ecosystems

Human Interactions With the Biosphere

Filters

What happens at the G₂ checkpoint?