Lesson Worksheet: Genes
and Chromosomes
Science
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In this worksheet, we will practice describing the
structure of chromosomes, and explaining what a
gene is.
Q1: A gene is a section of DNA that controls a
certain characteristic. Which of the following
statements about genes is true?
A
All living organisms have exactly the same
number of genes.
B
There are usually two copies of each gene
and one allele may dominate over the
other.
C
Each gene contains thousands of
chromosomes.
Q2: What shape is the structure of DNA
described as?
A
A triple coil
B
A double helix
C
A single twist
Q3: Which of the following scientists was not
involved in the discovery of the structure of
DNA?
A
Rosalind Franklin
B
Maurice Wilkins
C
James Watson
D
Charles Darwin
E
Francis Crick
Q4: Sometimes, the structure of DNA can
unexpectedly change. What term is given to this
change?
A
Degradation
B
Mutation
C
Alteration
D
Replication
E
Transformation
Q5: The genetic material found in your cells
contains large amounts of information that
determines your characteristics, like eye color
and hair color.
What is this genetic material called?
A
MNA
B
CNA
C
PNA
D
DNA
E
NAD
Q6: How many chromosomes does a normal
human body cell contain?
Q7: Which of the following best defines the
term gene?
A
A pair of chromosomes that have identical
sequences of DNA
B
A part of the physical appearance of a
person (e.g., having blue eyes)
C
A section of DNA that contains the
information needed to produce a
characteristic (e.g., eye color)
D
A long strand of DNA that is wound and
coiled into a condensed structure
Q8: Inside the nucleus, DNA is wound and
coiled into long strands. What are these strands
called?
A
Helices
B
Genes
C
Chromosomes
D
Nucleosomes
E
Ribosomes
Q9: The diagram shows a replicated
chromosome (a chromosome that has been
copied). The yellow highlight indicates a section
of DNA. This section of DNA determines what
hair color a person has. What key term can be
given to this section?
A
Characteristic
B
Mutation
C
Gene
D
Gamete
E
Trait
Q10: The diagram is of a simple animal cell,
with some key structures magnified. What key
structure does label Z indicate?
A
A nucleus
B
A section of DNA
C
A chromosome
D
A nucleosome
E A ribosome
This lesson includes 25 additional questions for
subscribers.
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