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WorksheetsCK12: Genetics 3.9 Human Chromosomes
Total questions: 12
Worksheet time: 4mins
Name
Class
Date
1.
Each species has a certain number of _______.
a)
Gene
b)
DNA
c)
Chromosomes
d)
Cell
e)
20
2.
Chromosomes are coiled structures of _____ and proteins.
a)
DNA
b)
RNA
c)
Protiens
d)
Lipids
e)
20
3.
Humans have ____ pairs of chromosomes.
a)
1
b)
23
c)
46
d)
100
e)
20
4.
Humans have ____ chromosomes (unpaired).
a)
1
b)
23
c)
46
d)
100
e)
20
5.
Humans have ____ pair of chromosomes to determine the sex.
a)
1
b)
23
c)
46
d)
100
e)
20
6.
The 22 pairs of chromosomes that do not determine the sex are called _____.
a)
Autosomal
b)
Egg
c)
Gametes
d)
Sperm
e)
20
7.
The two sex chromosomes are ___ and ___.
a)
X and X
b)
Y and Y
c)
X and Y
d)
20
8.
Males have ___ and ___ chromosomes .
a)
X and X
b)
Y and Y
c)
X and Y
d)
20
9.
Females have 2 ____ chromosomes.
a)
X
b)
Y
c)
XY
d)
20
10.
Without a Y chromosome, an individual develops into a ______.
a)
Female
b)
Male
c)
20
11.
A single Y chromosome gene, called ______, triggers an embryo to develop into a male.
a)
SRY
b)
ABC
c)
DNA
d)
RNA
e)
20
12.
Differences in alleles account for the considerable _______ ________.
a)
Clone
b)
Identical
c)
Genetic Variation
d)
DNA
e)
20
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