This document contains a quiz on basic genetics concepts including: 1) A family tree showing inheritance of the recessive genetic disorder phenylketonuria over three generations. 2) Questions about inheritance patterns such as dominance, codominance, sex linkage, and polygenic traits. 3) Definitions of key genetics terms like genotype, phenotype, gene, and allele.

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1. The genetic disorder phenylketonuria (PKU) is caused by a recessive allele (n). The
family tree below shows the incidence of the disease over three generations.
2. In Venetian Floozies, purple stripe color is dominant over pink. If you mate a male
purple striped Floozy that does not carry the pink gene to a female pink Floozy, what
percentage of the offspring would you expect to have purple stripes?
0%
25
%
50
%

2. 75
%
100
%
3. An individual heterozygous for a trait and an individual homozygous recessive for the
trait are crossed and produce many offspring that are
all the same genotype.
of two different
phenotypes
of three different
phenotypes.

3. all the same phenotype.
4. When a particular gene is said to be ‘sex-linked’, on which chromosome is that gene
usually present?
5. The genetic disorder phenylketonuria (PKU) is caused by a recessive allele (n). The
family tree below shows the incidence of the disease over three generations.
6. The appearance of an organism is its
genotype.
phenotyp
e.

4. genotype
ratio.
phenotype
ratio.
7. Red-green colorblindness is an X-linked recessive trait in humans. A colorblind woman
and a man with normal vision have a son. What is the probability that the son is
colorblind?
100
%
75%
50
%

5. 25
%
0
%
8. Polygenic traits are ones that are:
controlled by more than just a single pair of
alleles
responsible for a number of traits in the
phenotype
found in either men or women but not
both

6. 9. Some people have AB blood types for the ABO blood system. They have all of the
characteristics of both type A and type B blood--they are not a blend of them. The
inheritance pattern responsible for this is referred to as:
codominan
ce
dominance
blendin
g
10. A segment of DNA that controls a particular hereditary trait is called a(n) ___.
genotyp
e

7. heredity
allel
e
trait
gen
e
11. A red flower (RR) and a red flower (Rr) have the same
alleles.

8. genotyp
e.
haplotype
.
phenotyp
e.
12. The genetic disorder phenylketonuria (PKU) is caused by a recessive allele (n). The
family tree below shows the incidence of the disease over three generations.
What is the genotype of Jane's husband? (see Family Tree above)
The genotype of Jane's husband is (Nn).
13. Assuming that both parent plants in the diagram below are homozygous, why would
all of the f1 generation have yellow phenotypes?

9. because the f1 genotypes are
homozygous
because yellow is dominant over green
because both parents passed on yellow
alleles
14. If a paternal chromosome has alleles L, M, and n and the maternal chromosomes have
l, m, and N, then the chromosome that is not a product of crossing over is _____.