Biology: The Dynamic Science

Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter 11

Meiosis: The Cellular Basis of Sexual Reproduction - all with Video Answers

Educators

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Chapter Questions

Problem 1

The chromosome constitution number of this individual is $2 n=6$.
This drawing represents
a. mitotic metaphase.
b. meiotic metaphase I.
c. meiotic metaphase II.
d. a gamete.
six nonhomologous chromosomes.

Bryan Valdivia

Bryan Valdivia

Numerade Educator

Problem 2

Which of the following is not associated with sperm production?
a. daughter cells identical to the parent cell
b. variety in resulting cells
c. chromosome number halved in resulting cells
d. four daughter cells arising from one parent cell
e. 23 chromosomes in the human sperm

Bryan Valdivia

Numerade Educator

Problem 3

Chiasmata:
a. form during metaphase II of meiosis.
b. occur between two nonhomologous chromosomes.
c. represent chromosomes independently assorting.
d. are sites of DNA exchange between homologous chromatids.
ensure the resulting cells are identical to the parent cell.

Bryan Valdivia

Numerade Educator

Problem 4

If $2 n$ is four, the number of possible combinations of chromosomes in the resulting gametes, excluding any crossing-over is:
a. 1
b. 2
c. 4
d. $8 .$
e. 16

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Victoria Sindorf

Numerade Educator

Problem 5

In meiosis:
a. homologous chromosomes pair at prophase II.
b. chromosomes segregate from their homologous partners at anaphase I.
c. the centromeres split at anaphase I.
d. a female gamete has two $X$ chromosomes.
e. reduction of chromosome number occurs in meiosis II.

Bryan Valdivia

Numerade Educator

Problem 6

The DNA content in a diploid cell in $\mathrm{G}_{2}$ is $\mathrm{X}$. If that cell goes into meiosis at metaphase II, the DNA content will be:
a. $0.1 X$.
b. $0.5 X$
$\mathbf{x}$
d. $2 X$
e. $4 \mathrm{X}$.

Joanna Quigley

Numerade Educator

Problem 7

Metaphase in mitosis is similar to what stage in meiosis?
a. prophase I
b. prophase II
c. metaphase I
d. metaphase II
e. crossing-over

Bryan Valdivia

Numerade Educator

Problem 8

In the human sperm:
a. there must be one chromosome of each type, except for the sex chromosomes, where either an $\mathrm{X}$ or a $\mathrm{Y}$ chromosome is present.
b. a chromosome must be represented from each parent.
c. there must be an unequal number of chromosomes from both parents.
d. there must be representation of chromosomes from only one parent.
there is the possibility of 246 different combinations of maternal and paternal chromosomes.

Bryan Valdivia

Numerade Educator

Problem 9

In plants, the adult diploid individuals are called:
a. spores.
b. sporophytes.
c. gametes.
d. gametophytes.
e. zygotes.

Bryan Valdivia

Numerade Educator

Problem 10

Which of the following sequences of events describes the general life cycle of an animal?
a. $2 n \rightarrow$ meiosis $\rightarrow 2 n \rightarrow$ fertilization $\rightarrow 1 n$
b. $1 n \rightarrow$ meiosis $\rightarrow 2 n \rightarrow$ fertilization $\rightarrow 1 n$
c. $2 n \rightarrow$ meiosis $\rightarrow 1 n \rightarrow$ fertilization $\rightarrow 2 n$
d. $2 n \rightarrow$ mitosis $\rightarrow 1 n \rightarrow$ fertilization $\rightarrow 2 n$
$2 n \rightarrow m$ itosis $\rightarrow 1 n \rightarrow$ fertilization $\rightarrow 1 n$

Bryan Valdivia

Numerade Educator