Question 1

In both spermatogenesis and oogenesis, one sperm/egg forms from one primary spermatocyte/oocyte.

Accepted Answer

A) True 
 B)False  False

Question 2

List the stages of meiosis I and explain the events that occur during each stage.

Accepted Answer

Prophase I: Chromosomes become visible. Pairing of homologous chromosomes occur. Metaphase I: Duplicated homologous chromosomes line up at the equator of the cell.
Anaphase I: Homologous chromosomes are separated and move towards opposite sides of the cell. Cytokinesis begins.
Telophase I: Two haploid daughter cells are produced as the cytokinesis is completed.

Question 3

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 A

Question 4

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 5

Which aspect of the cytoskeleton is involved in the cleavage furrow?

Accepted Answer

A)  microtubules 
B)  intermediate filaments 
C)  actin filaments 
D)  centrioles 
E)  spindle fibers 
A)  microtubules 
B)  intermediate filaments 
C)  actin filaments 
D)  centrioles 
E)  spindle fibers

Question 6

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 7

In a karyotype of duplicated chromosomes, each chromosome contains two sister chromatids.

Accepted Answer

A) True 
 B)False

Question 8

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

Question 9

In what stage of meiosis does synapsis occur?

Accepted Answer

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

Question 10

At what stage of mitosis do sister chromatids become full-fledged chromosomes?

Accepted Answer

A)  prophase 
B)  metaphase 
C)  anaphase 
D)  telophase 
E)  cytokinesis 
A)  prophase 
B)  metaphase 
C)  anaphase 
D)  telophase 
E)  cytokinesis

Question 11

External signals, such as hormones and growth factors, can stimulate a cell to go through the cell cycle.

Accepted Answer

A) True 
 B)False

Question 12

How are Jacobs and Klinefelter syndromes alike?

Accepted Answer

A)  Both have only two X chromosomes. 
B)  Both have only two Y chromosomes. 
C)  Both have three sex chromosomes. 
D)  Both have one sex chromosome. 
E)  Both have only 45 chromosomes. 
A)  Both have only two X chromosomes. 
B)  Both have only two Y chromosomes. 
C)  Both have three sex chromosomes. 
D)  Both have one sex chromosome. 
E)  Both have only 45 chromosomes.

Question 13

In which two phases of mitosis does the nuclear membrane appear or disappear?

Accepted Answer

A)  prophase and metaphase 
B)  metaphase and anaphase 
C)  prophase and anaphase 
D)  anaphase and telophase 
E)  prophase and telophase 
A)  prophase and metaphase 
B)  metaphase and anaphase 
C)  prophase and anaphase 
D)  anaphase and telophase 
E)  prophase and telophase

Question 14

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 15

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 16

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

Accepted Answer

A) True 
 B)False

Question 17

Sexual reproduction introduces more genetic variation than does asexual reproduction.

Accepted Answer

A) True 
 B)False

Question 18

What is the genetic makeup of an individual who has inherited Jacobs syndrome?

Accepted Answer

A)  XYY 
B)  XXX 
C)  XXY 
D)  XO 
E)  none of these 
A)  XYY 
B)  XXX 
C)  XXY 
D)  XO 
E)  none of these

Question 19

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 20

If the secondary oocyte is not fertilized, it does not complete meiosis II.

Accepted Answer

A) True 
 B)False

Exam 19: Patterns of Chromosome Inheritance

In both spermatogenesis and oogenesis, one sperm/egg forms from one primary spermatocyte/oocyte.

List the stages of meiosis I and explain the events that occur during each stage.

In humans, how many of the chromosomes are autosomes?

In a karyotype, the chromosomes are arranged in order from

Which aspect of the cytoskeleton is involved in the cleavage furrow?

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

In a karyotype of duplicated chromosomes, each chromosome contains two sister chromatids.

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

In what stage of meiosis does synapsis occur?

At what stage of mitosis do sister chromatids become full-fledged chromosomes?

External signals, such as hormones and growth factors, can stimulate a cell to go through the cell cycle.

How are Jacobs and Klinefelter syndromes alike?

In which two phases of mitosis does the nuclear membrane appear or disappear?

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

What is the structure that holds the chromatids together?

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

Sexual reproduction introduces more genetic variation than does asexual reproduction.

What is the genetic makeup of an individual who has inherited Jacobs syndrome?

What structure is not divided during cytokinesis?

If the secondary oocyte is not fertilized, it does not complete meiosis II.

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Patterns of Genetic Inheritance

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