WorksheetsDNA, Chromosomes, Genes
Total questions: 22
Worksheet time: 18mins
Name
Class
Date
1.
Which of the following best describes a DNA molecule?
a)
double helix
b)
contains ribose
c)
made of amino acids
d)
contains Uracil
2.
Guanine bonds with ______________.
a)
Adenine
b)
Guanine
c)
Cytosine
d)
Thymine
3.
Why is DNA important?
a)
it is very small and very complicated
b)
it's in everything
c)
it serves as the blueprint for traits of all living things
d)
because we eat it every day for energy
4.
Which organelle is DNA usually found in?
a)
cell membrane
b)
vacuole
c)
chloroplast
d)
nucleus
5.
What determines the code, or information, of a DNA molecule?
a)
the shape (structure) of the nitrogen bases
b)
the order (sequence) of the nitrogen bases
c)
the color of the nitrogen bases
d)
the frequency (number) of nitrogen bases
6.
What is a gene
a)
A long length of DNA that codes for a chromosome
b)
A short length of DNA that codes for a chromosome
c)
A short length of DNA that codes for a protein.
7.
The number of human chromosomes is
a)
23
b)
46
c)
92
d)
64
8.
How are similarities passed from parent to offspring?
a)
through teaching
b)
through learning
c)
through blood
d)
through genes
9.
A change in DNA or chromosomes
a)
Mitosis
b)
Meiosis
c)
mutation
d)
Osmosis
10.
This image shows a...
a)
Punnett Square
b)
Phenotype
c)
Genotype
d)
Dominant allele
11.
What does a Punnett Square help you do?
a)
Determine the ratio of phenotypes
b)
Determine the ratio of genotypes
c)
Predict possible traits the offspring will have
d)
All of the above
12.
Dominant alleles are-
a)
capital
b)
lowercase
c)
both
d)
neither
13.
Recessive alleles are-
a)
capital
b)
lowercase
c)
both
d)
neither
14.
Tt is-
a)
homozygous dominant
b)
homozygous recessive
c)
heterozygous
d)
none of these
15.
Alleles are the different forms of a gene that is expressed as
a)
a letter
b)
two capital letters
c)
two lower case letters
d)
a phenotype
16.
A ______________ organism has to different alleles for a trait.
a)
purebred
b)
hybrid
c)
twin
d)
small
17.
An organisms _________________ is its physical appearance or visible trait.
a)
genotype
b)
hybrid
c)
phenotype
d)
purebred
18.
An organism's ___________________ is its genetic make up, or two alleles.
a)
genotype
b)
phenotype
c)
jeans
d)
phonetype
19.
A homozygous organism can also be known as a ____________.
a)
punnett square
b)
wonderbread
c)
hybrid
d)
purebred
20.
Which of the following genotypes is homozygous dominant?
a)
A
b)
Aa
c)
AA
d)
aa
21.
What is the phenotype of the offspring? (A-Brown hair; a-blond hair)
a)
50 % Brown Hair and 50% Blond Hair
b)
25 % Brown Hair and 75% Blond Hair
c)
75 % Brown Hair and 25% Blond Hair
d)
0% Brown Hair and 100% Blond Hair
22.
Which of the following genotypes is heterozygous?
a)
Bb
b)
BB
c)
bb
d)
B
100 %
