Chapter 12:
Patterns of Heredity and Human Genetics
1.
What can you determine by studying this karyotype?
a.
The person is a male with Down syndrome.
b.
Some of the chromosomes are curved, so this person has sickle-cell disease.
c.
The person is a male with hemophilia.
d.
The person is a female with Turner syndrome.
Hint
2.
Which of the following is NOT true?
a.
Males inherit the allele for hemophilia on the Y chromosome from their mother, if she is a carrier.
b.
A karyotype is a chart of chromosome pairs generated on a computer.
c.
Queen Victoria of England was a carrier of the sex-linked trait for hemophilia.
d.
Sickle-cell disease causes abnormal red blood cells, shaped like sickles, to block small blood vessels.
Hint
3.
According to this Punnett square, what is the chance that a human offspring will be male or female?
a.
50%
b.
25%
c.
100%
d.
75%
Hint
4.
A child is born to a mother with blood type
I
A
I
B
and a father with blood type
I
B
i
. Which of the following blood types is impossible for the child to have?
a.
A
b.
O
c.
B
d.
AB
Hint
5.
When making a pedigree, which of these symbols is used to represent an affected male?
a.
b.
c.
d.
Hint
6.
Which of these could be the blood type of a child with a father of blood type
I
A
I
A
and a mother of blood type
I
A
I
A
?
a.
B
b.
AB
c.
O
d.
A
Hint
7.
Which of these statements about Huntington's disease is true?
a.
There is currently no effective treatment of Huntington's disease.
b.
The onset of Huntington's disease is typically between birth and three years of age.
c.
Genetic tests to detect the presence of the allele responsible for Huntington's disease do not exist at this time.
d.
Huntington's disease is caused by the expression of a recessive allele.
Hint
8.
__________ cause the phenotypes of both homozygotes to be produced in heterozygous individuals.
a.
Codominant alleles
b.
Environmental influences
c.
Incomplete dominances
d.
mutations
Hint
9.
Which of these is NOT an example of a simple dominant trait?
a.
a hitchhiker's thumb
b.
a widow's peak hairline
c.
a cleft chin
d.
cystic fibrosis
Hint
10.
Traits that are controlled by genes found on the sex chromosomes are __________.
a.
heterozygous
b.
sex-linked traits
c.
polygenic inheritance
d.
autosomes
Hint
11.
Which of these statements is true?
a.
Temperature plays a role in the color of the fur of the arctic fox.
b.
Traits for human skin color are governed by only one gene.
c.
Premature balding is a dominant gene in human males and females.
d.
The color of a peacock's feathers is always the same as the color of a peahen's feathers.
Hint
12.
People who have ancestors from which of these countries typically have a higher incidence rate of PKU?
a.
Greece
b.
Sweden
c.
England
d.
South Africa
Hint
13.
Which of these statements is NOT true?
a.
Human males produce two kinds of gametes, called X and Y.
b.
Homologous autosomes look alike.
c.
If you are a female, your 23rd pair of chromosomes are XX.
d.
The 23rd pair of chromosomes are exactly the same in human males and females.
Hint
14.
What is polydactyly?
a.
A condition characterized by the formation and accumulation of thick mucus in the lungs and digestive tract.
b.
A condition characterized by having the absence of an enzyme that converts phenylalanine to tyrosine.
c.
A condition characterized by having six fingers.
d.
A condition characterized by the accumulation of lipids in cells.
Hint
15.
Which of these is a symptom of hemophilia?
a.
tissue damage from blocked blood flow
b.
inability to differentiate between shades of red and green
c.
some degree of mental retardation
d.
cuts that take a long time to stop bleeding
Hint
