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Genetics Quiz Review Answers
Name:
Core:
Look over all items in your Genetics unit and study the following topics.
-DNA
-Who modeled
-Shape
-Different Parts
-4 bases
-Location
-Mistakes
-Chromosomes
-Shape
-Location
-How many humans have
People Matching
Person
1. E King George III
2. D Gregor Mendel
3. B Rosalind Franklin
4. F Watson/Crick
5. A Reginald Punnett
6. C Charles Darwin
Known for...
A. Devised the punnett square to depict
the number and variety of genetic
combinations
B. Made important contributions to the
structure of DNA using X-ray diffraction
C. Proposed the theory of evolution
including a process that he called natural
selection.
D. Father of genetics
E. Suffered from the “madness,” but
showed it could run in the family
F. Deduced the structure of DNA
Vocabulary
Term
Definition or example
Homozygous
Same AA or aa
Heterozygous
Different Aa
Allele
Alleles that have more influence in determining
a trait; Upper case
AA
Alleles that have less influence in determining a
trait; Lower case
aa
Locations on chromosomes that affect features
of organisms
Genes
Paired alleles on a chromosome
Genotype
an organism’s genetic makeup
Phenotype
an organism’s outward appearance
Genetics
branch of science that has to do with heredity
Adaptations
Any structure or behavior of an organism that
increases its chances of surviving and
reproducing.
Selective Pressure
Environmental pressures on populations
Dominant
Recessive
Punnett Squares
A widowʼs peak in humans is determined by a dominant/recessive inheritance. A person
who is purebred for widowʼs peak is crossed with a person who is purebred for no
widowʼs peak. All of the offspring have a widowʼs peak. Which trait is dominant and
which is recessive? Show a punnett square to support your answer.
W
Having a widow’s peak is dominant (WW or Ww) since
this trait shows up more often.
w
WW and Ww = widow’s peak
W
Ww
Ww
Ww
Ww
ww = no widow’s peak
w
Fill in the punnett square, genotype, and phenotype using the information below.
t
Tall = TT or Tt
T
Tt
t
Tt
Short = tt
t
tt
0/4 TT
2/4 Tt
2/4 tt
tt
2/4 Tall
2/4 Short
Pedigree Charts
Below is a pedigree chart depicting how colorblindness is inherited. A female with the
colorblindness defect in one X chromosome is a carrier of colorblindness. Male children of a
female carrier are likely to be colorblind. Male children of a male with colorblindness and a
female carrier are extremely likely to be colorblind. If a mother is colorblind then she will cause
her sons to be colorblind but her daughters will be carriers. If both parents are colorblind then it
is impossible for their children not to be colorblind as well. Colorblind is recessive, being a carrier
is dominant recessive.
Fill in the genotypes using RR, Rr, or rr for this Pedigree Chart.
rr
RR
RR
Rr
RR
RR
Rr
Rr
RR
RR
RR
rr
Rr
rr
RR
Rr
rr
Rr
rr
rr
(Rr)
rr
RR
Rr
RR
RR