DNA Study Guide
Question 1
The cells that make up the skin of an individual have
some functions different from the cells that make up
the liver because
a. all cells have a common ancestor.
b. different cells have different genetic material.
c. environment and past history have no influence on
cell function.
d. different parts of genetic instructions are used in
different types of cells.
Question 1 Notes
• All of your cells have the same DNA
• Not all genes are expressed in every cell
Question 2
Fruit flies with the curly-wing trait will develop straight
wings if kept at a temperature of 16°C during development
and curly wings if kept at 25°C. The best explanation for
this change in the shape of wings is that the
a. genes for curly wings and genes for straight wings are
found on different chromosomes.
b. type of genes present in the fruit fly is dependent upon
environmental temperature.
c. environment affects the expression of the genes for this
trait.
d. higher temperature produces a gene mutation.
Question 2 Notes
• The environment can influence how genes are
expressed
Question 3
Genes involved in the production of abnormal
red blood cells have an abnormal sequence of
a. ATP molecules.
b. amino acids.
c. sugars.
d. bases.
Question 3 Notes
• All proteins, traits, genes, etc. can be traced
back to the order of bases in DNA
Question 4
Klinefelter’s syndrome is a genetic disorder caused by
the presence of an extra chromosome in the body cells
of humans. This extra chromosome occurs in the
gamete as a result of
a. an error in the process of cloning.
b. an error in meiotic cell division.
c. a gene mutation.
d. replication of a single chromosome during mitosis.
Question 4 Notes
• When chromosomes fail to separate during
meiosis, this is called nondisjunction. It can
cause genetic disorders such as Klinefelter’s,
Turner’s, and Down syndrome.
Question 5
Which amino acid chain would be produced by the
DNA base sequence below?
C-A-G-G-T-C-A-A-G-T-T-G-T-T-A-T-G-A
a. Val – Glu – Phe – Asp – Thr – Asp
b. Val – Pro – Phe – Asp – Asp – Thr
c. Val – Glu – Phe – Asp – Asp – Thr
d. Val – Glu – Phe – Thr – Asp – Asp
Question 5 Notes
• DNA and RNA both have to be read in 3 letter
“words” called codons. These codons match
up with amino acids to form proteins.
Complete the rest of the study guide and check
your answers.