Question 1

Suppose that nondisjunction occurs during meiosis II in oogenesis,and each of the resulting 4 cells is fertilized with a normal sperm.How many cells are normal and how many have a chromosomal trisomy?
A)1,3
B)2,2
C)3,1
D)2,1
E)1,2

Accepted Answer

Two cells will be normal,one cell will have an extra copy (trisomy),and one cell will have a missing copy (monosomy).

Question 2

How are mitosis and cytokinesis alike?
A)Both involve the nucleus.
B)Both involve mitochondria.
C)Both involve division.
D)Both involve apoptosis.
E)Both involve DNA synthesis.

Accepted Answer

Both mitosis and cytokinesis involve division.In mitosis the DNA divides while in cytokinesis,the cytoplasm divides.

Question 3

Which cell could you not use to produce a karyotype?
A)white blood cells
B)red blood cells
C)epithelial cells
D)smooth muscle cells
E)skeletal muscle cells

Accepted Answer

Red blood cells do not have a nucleus and thus cannot be used for a karyotype.

Question 4

How are G₁ and G₂ different? A)The cell copies its DNA during G₁ but not G₂. B)The cell does not grow during G₁ but doubles its organelles in G₂. C)In G₁,the cell prepares to synthesize its DNA and in G₂,it synthesizes the proteins needed for cell division. D)The cell spends much more time in G₂ than in G₁. E)Mitosis occurs during G₁ but not during G₂.

Accepted Answer

In G₁,the cell prepares to synthesize its DNA,while in G₂,the cell synthesizes the proteins needed for cell division.

Question 5

In a karyotype it can be seen that a homologous pair of chromosomes will contain how many chromatids?
A)one
B)two
C)three
D)four
E)six

Accepted Answer

Each homologue contains 2 chromatids,so a homologous pair contains 4 chromatids.

Question 6

In a karyotype,the chromosomes are arranged in order from
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.

Accepted Answer

In a karyotype,the chromosomes are arranged by size from largest to smallest with the sex chromosomes separate.

Question 7

What is the structure that holds the chromatids together?
A)centromere
B)chromatin
C)chromosomes
D)karyotype
E)none of these

Accepted Answer

The centromere holds the chromatids together.Chromatin is collectively the DNA and proteins.The chromosomes are the structures that assist in the transmission of genetic material from one generation to the next.A karyotype is the display of the chromosomes.

Question 8

List the stages of mitosis and explain the key events during each of the stages.

Accepted Answer

The answer of List the stages of mitosis and explain...

Question 9

How are Jacobs and Klinefelter syndromes alike?
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.

Accepted Answer

In Klinefelter syndrome,the sex chromosomes are XXY while in Jacobs syndrome,the sex chromosomes are XYY.In both cases,there are three sex chromosomes.

Question 10

How many of the chromosomes are considered autosomes?
A)22 pairs
B)22
C)1 pair
D)46
E)23 pairs

Accepted Answer

Pairs 1 - 22 are considered autosomes.The 23rd pair is the sex chromosome.

Question 11

From a karyotype,you could tell all of the following about the cell except whether
A)a fusion of two chromosomes had occurred.
B)a translocation had occurred between two chromosomes.
C)one chromosome was missing.
D)there were three copies of a chromosome present.
E)a particular gene contained a mutation.

Accepted Answer

You can see chromosome structure in a karyotype but not gene mutations.

Question 12

How long does it take to proceed from prophase I to metaphase I in oogenesis?
A)One follows directly after the other.
B)There is usually a pause of about 1 hour.
C)It varies,but on the order of years.
D)There is a pause for a day.
E)There is a pause for about a month.

Accepted Answer

The cells are arrested in prophase I and do not complete metaphase I until after puberty upon ovulation.

Question 13

Two sister chromatids are held together at the
A)centromere.
B)spindle.
C)aster.
D)telomere.
E)autosomE.

Accepted Answer

Sister chromatids are held together at the centromere.

Question 14

The centromere is the structure that holds the chromatids together.

Accepted Answer

The centrome is the structure that will hold the chromatids together within the cell.

Question 15

In a karyotype,each chromosome contains two sister chromatids.

Accepted Answer

When a karyotype is done,the chromosomes have already duplicated and appear as two sister chromatids.

Question 16

How many chromosome pairs does a human have?
A)23
B)25
C)46
D)50
E)92

Accepted Answer

A human cell contains 23 pairs of chromosomes.

Question 17

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

Accepted Answer

The answer of List the stages of interphase and the...

Question 18

In what way is spermatogenesis similar to oogenesis?
A)Both occur continuously from puberty on.
B)Both result in 4 daughter cells.
C)Both result in cells with half the chromosome number.
D)Both are arrested in prophase I.
E)Both result in 1 or 2 polar bodies.

Accepted Answer

Both are forms of meiosis in which the daughter cells contain half the chromosome number.Oogenesis will pause during the course of the monthly cycle.Only spermatogenesis will result in 4 daughter cells.Oogenesis produces 1 egg and 2 polar bodies.Spermatogenesis does not pause in prophase I.Only oogenesis results in 1 or 2 polar bodies.

Question 19

If a cell has 4 pairs of chromosomes,after mitosis each daughter cell will have how many chromosomes?
A)2
B)4
C)8
D)16
E)32

Accepted Answer

Each will have 4 pair,or 8 chromosomes.

Question 20

In which two phases of mitosis does the nuclear membrane appear or disappear?
A)prophase and metaphase
B)metaphase and anaphase
C)prophase and anaphase
D)anaphase and telophase
E)prophase and telophase

Accepted Answer

The nuclear membrane disappears in prophase and reappears in telophase.

Quiz 19: Patterns of Chromosome Inheritance

Suppose that nondisjunction occurs during meiosis II in oogenesis,and each of the resulting 4 cells is fertilized with a normal sperm.How many cells are normal and how many have a chromosomal trisomy?

How are mitosis and cytokinesis alike?

Which cell could you not use to produce a karyotype?

How are G1 and G2 different?

In a karyotype it can be seen that a homologous pair of chromosomes will contain how many chromatids?

In a karyotype,the chromosomes are arranged in order from

What is the structure that holds the chromatids together?

List the stages of mitosis and explain the key events during each of the stages.

How are Jacobs and Klinefelter syndromes alike?

How many of the chromosomes are considered autosomes?

From a karyotype,you could tell all of the following about the cell except whether

How long does it take to proceed from prophase I to metaphase I in oogenesis?

Two sister chromatids are held together at the

The centromere is the structure that holds the chromatids together.

In a karyotype,each chromosome contains two sister chromatids.

How many chromosome pairs does a human have?

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

In what way is spermatogenesis similar to oogenesis?

If a cell has 4 pairs of chromosomes,after mitosis each daughter cell will have how many chromosomes?

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

How are G₁ and G₂ different?