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Meiosis and Crossover

Total questions: 44

Worksheet time: 44mins

Name
Class
Date
1.
What is it called when a sperm and egg meet?
a)
meiosis
b)
fertilization
c)
cell division
d)
mitosis
2.
Which process and type of resulting cells are represented?
a)

mitosis, gametogenesis

b)
mitosis, body cells
c)

meiosis, gametogenesis

d)

meiosis, somatic cells

3.

Homologous chromosomes are chromosomes with the

a)

same genes in the same location, though alleles can be different

b)

are also known as sister chromatids

c)

homozygous always

d)

same length, though the centromere location can vary

4.
The chromosomes that pair up during meiosis, are called __________ chromosomes.  
a)
homozygous 
b)
asexual
c)
homologous
d)
genes
5.

The DIPLOID number, 2n, of chromosomes shown is

a)

2

b)

4

c)

8

d)

impossible to determine

6.
A male shark has 40 chromosomes in each of its sex cells. How many would be present in its body cells?
a)
20
b)
40
c)
80
d)
160
7.
Which letter(s) in the diagram correspond to cells that are haploid? 
a)
A
b)
B
c)
C
d)
A and B
8.
What causes genetic variation in meiosis?
a)
chromosomes lining up
b)
crossing over of chromosomes
c)
separation of chromosomes
d)
chromosomes pulling apart
9.

What is one of the advantages, to reproduce sexually versus asexually?

a)
survival of the fittest
b)
overproduction
c)
genetic variation
d)
cloning
10.
Crossing over helps promote 
a)
male genotype
b)
genetic variation
c)
DNA replication
d)
mitosis
11.
A human zygote should have _____ chromosomes inside.
a)
46
b)
23
c)
92
d)
64
12.

A human being has a somatic cell that has 46 chromosomes.  What is our haploid number found in a gamete?

a)
23
b)
46
c)
69
d)
92
13.
Diploid Cells are represented by
a)
2n
b)
n
c)
4n
d)
1/2 n
14.

This event...

a)

increases genetic variation

b)

takes place in prophase I

c)

is known as cross- over

d)

all are true

15.

CROSSING OVER TAKES PLACE DURING

a)

PROPHASE II

b)

PROPHASE I

c)

INTERPHASE

d)

METAPHASE I

16.

During which phase of meiosis does genetic variation increase?

a)

PROPHASE II

b)

PROPHASE I

c)

ANAPHASE I

d)

ANAPHASE II

17.

MEIOSIS

a)

Reduces the number of chromosomes by half

b)

produces unique sex cells, each different from the other

c)

allows traits to be passed down from parent to offspring

d)

Increases genetic variation

e)

all true

18.

MITOSIS

a)

Produces 4 very different gametes

b)

Allows traits to be varied

c)

produces 2 identical daughter cells

d)

all are true

19.

1N AND N MEAN THE SAME THING (LIKE MATH)

a)

TRUE

b)

FALSE

20.

WHICH OF THE FOLLOWING DO NOT OCCUR DURING THE MITOSIS STAGE OF THE CELL CYCLE

a)

SISTER CHROMATIDS SEPARATE LIKE IN ANAPHASE

b)

DNA IS REPLICATED LIKE IN THE S PHASE

c)

CHROMOSOMES LINE UP AT THE EQUATOR LIKE METAPHASE

d)

CHROMATIN CONDENSES INTO CHROMOSOMES

21.

What part of the cell disappears during mitosis and meiosis, during Prophase and reappears in Telophase?

a)

nuclear membrane

b)

cell membrane

c)

chromosomes

22.

Homologous pairs line up in the middle of the cell in what phase of Meiosis?

a)

Metaphase I

b)

Metaphase II

c)

Mitosis

d)

Prophase II

23.

When chromosomes cross over they form what?

a)

A tetrad

b)

A spindle fiber

c)

A chromatid

24.

What phase is in the picture?

a)

Prophase 1

b)

Prophase 2

c)

Telophase 2

25.
How many daughter cells are produced at the end of meiosis?
a)
1
b)
2
c)
3
d)
4
26.
Before mitosis or meiosis can begin, DNA must go through Interphase. This is when...
a)
DNA replicates
b)
DNA splits
c)
DNA forms chromosomes
d)
Chromosomes cross over
27.
In meiosis, Prophase 1 is when chromosomes...
a)
cross over
b)
mutate
c)
hybridize
d)
fertilize
28.
What is one reason why we need meiosis?
a)
To double the number of chromosomes going into sex cells
b)
To halve the number of chromosomes going into sex cells
c)
To triple the number of chromosomes going into sex cells
d)
To not change the number of chromosomes going into sex cells
29.
What phase is  shown in the picture?
a)
anaphase 1
b)
anaphase 2
c)
metaphase 1
d)
telophase 1
30.
What phase is  shown in the picture?
a)
anaphase 1
b)
anaphase 2
c)
metaphase 1
d)
telophase 1
31.
What phase is shown here?
a)
Prophase II
b)
Metaphase I
c)
Metaphase II
d)
Anaphase I
32.
What phase is shown here?
a)
Anaphase II
b)
Metaphase I
c)
Anaphase I
d)
Telophase II
33.
What phase is shown here?
a)
Metaphase II
b)
Telophase I
c)
Telophase II
d)
Metaphase I
34.
What phases is shown here?
a)
Prophase II
b)
Prophase I
c)
Anaphase II
d)
Interphase I
35.
What phase is shown here?
a)
Anaphase I
b)
Prophase I
c)
Metaphase II
d)
 Metaphase I
36.
What phase is shown here?
a)
Telophase II
b)
Anaphase II
c)
Metaphase I
d)
Interphase I
37.
What phase is shown here?
a)
Telophase I
b)
Metaphase II
c)
Telophase II
d)
Anaphase I
38.
What phase is this?
a)
Interphase II
b)
Prophase I
c)
Metaphase I
d)
Anaphase II
39.
Meiosis makes sperm and egg cells. In humans, sperm and egg cells each have _____ chromosomes. Therefore a fertilized human egg cell (sperm and egg cell combined) would create a cell with _____ chromosomes.
a)
23, 46
b)
46, 23
c)
2, 4
d)
50, 100
40.

If this takes place in males, this process is known as __ and results in 4 male gametes

a)

oogenesis

b)

spermatogenesis

c)
meiosis, gametes
41.
If a somatic cell in a butterfly contains 24 chromosomes, a butterfly egg would contain
a)
3
b)
6
c)
12
d)
24
42.

The HAPLOID number, 1n, of chromosomes shown is

a)

2

b)

4

c)

8

d)

impossible to determine

43.

In females, gametogenesis is known as __ and results in __.

a)

oogenesis; one ovum gamete, not four

b)

oogenesis; four gametes

c)

spermatogenesis; one sperm cell, not four

d)

spermatogenesis; four sperm cells, all 2n

44.

What is one of the reasons we need meiosis?

a)
So the offspring has genes from both parents
b)
So the offspring has genes from one parent
c)
So the offspring has genes from neither parents
d)
So the offspring makes its own genes

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