AnswersFL-2000310-Biology 1 AUnit Test

Meiosis Answers

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After chromosomes are formed, during which phase of mitosis do the chromosomes attach to the spindle fibers by their centromeres?

A
anaphase
B
prophase
C
metaphase
D
telophase
2
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Scientists use tissue cultures to study possible medicines that can be used to treat cancer patients. What is one benefit of this procedure?

A
Patients do not receive harmful or ineffective medication.
B
The cultured cells are not in their normal environment.
C
Doctors know how to treat all types of cancer.
D
One tissue culture can be used for all cancer patients.
3

In which phase of mitosis are chromosomes first seen as a result of chromatin coiling?

A
prophase
B
anaphase
C
metaphase
D
telophase
4

An example of mitosis at work is a plant root

A
elongating.
B
absorbing.
C
pointing down.
D
breaking.
5

Centromeres split apart during

A
prophase
B
metaphase
C
anaphase
D
telophase
6

Which statement best describes cancer cells?

A
They grow as a single layer of cells.
B
They cease to reproduce after 20–50 mitotic divisions.
C
They reproduce only when needed to replace missing cells.
D
They are not regulated by contact inhibition.
7

Which of the steps in this sequence of events is an example of mitosis at work?

A
A baseball hits the arm of a baseball player.
B
The player reacts quickly grabbing his arm.
C
A bruise forms where the ball hit the arm.
D
The bruise slowly disappears as the arm heals.
8

Which are replicated during interphase?

A
sister chromatids
B
chromosomes
C
centromeres
D
nuclei
9

Which statement accurately describes the relationship between cytokinesis and mitosis?

A
Mitosis includes interphase and cytokinesis.
B
Cytokinesis precedes mitosis in the cell cycle.
C
Cytokinesis is not a phase of mitosis, but occurs during mitosis.
D
Interphase includes cytokinesis and mitosis.
10

Which best describes the importance of mitosis to living organisms?

A
genetic variation and growth
B
growth and development
C
development and sexual reproduction
D
sexual reproduction and genetic variation
11

Which process of genetic recombination involves genes from both parents?

A
crossing over
B
independent assortment
C
fertilization
D
tetrad formation
12

During which phase of meiosis does crossing over of chromosomes occur?

A
prophase I
B
metaphase I
C
anaphase I
D
telophase I
13

Which discovery did Gregor Mendel make?

A
Traits are inherited independently of each other.
B
Traits are inherited as a tetrad.
C
Traits are inherited as homologous pairs.
D
Traits are inherited as a set, from one parent.
14

Genetic variation occurs through genetic recombination.Which method of genetic recombination is illustrated in the diagram?

Question illustration
A
independent assortment
B
fertilization
C
crossing over
D
sexual reproduction
15

Which three processes are methods of genetic recombination?

A
natural selection, crossing over, and independent assortment
B
crossing over, independent assortment, and fertilization
C
independent assortment, fertilization, and natural selection
D
fertilization, natural selection, and crossing over
16

Which is a homologous chromosome pair?

A
chromatid
B
zygote
C
gamete
D
tetrad
17

In his study of pea plants, Gregor Mendel used which method to produce offspring?

A
cross-pollination, by using parents that had identical traits
B
cross-pollination, by using parents that had different traits
C
self-pollination, by using one parent
D
random pollination, by using both identical- and different-trait matings
18

Which definition correctly describes a haploid cell during meiosis?

A
a cell that has double the number of chromosomes as the parent cell
B
a cell that has two complete sets of chromosomes
C
a cell that has half the number of chromosomes as the daughter cell
D
a cell that has one complete set of chromosomes
19

How many cell divisions occur during meiosis?

A
one
B
two
C
three
D
four
20

The diagram illustrates one method of genetic recombination.Which method of genetic recombination is illustrated in the diagram?

Question illustration
A
crossing over
B
independent assortment
C
fertilization
D
tetrad formation

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