WorksheetsHuman Genetics
Total questions: 15
Worksheet time: 13mins
Name
Class
Date
1.
A child is diagnosed with a rare disease. Neither parent has the disease. How did the child inherit the disorder?
a)
The disorder is dominant and carried by a parent.
b)
The disorder is recessive and carried by both parents.
c)
The disorder is sex-linked and inherited only from the father.
d)
A mutation in the child occurred.
2.
Two healthy parents have a child with CF. What is the best explanation?
a)
Not the result of a genetic disorder.
b)
Both parents carry the recessive gene.
c)
CF is a chromosomal mutation and not related to parental genotypes.
d)
CF is caused by a mutation in pair 21.
3.
CF and Tay-Sachs are typical of recessive disorders concentrated in ___.
a)
ethnic groups
b)
families with single child
c)
countries with hot climates
d)
the U.S.
4.
Most genetic disorders are caused by the expression of___.
a)
recessive alleles
b)
2 dominant alleles
c)
one dominant allele
d)
sex-linked heredity
5.
Which of the following situations is most usual for a dominant allele that results in severe effects in the offspring?
a)
both parents have the trait
b)
the trait occurs by mutation
c)
only a single offspring has the trait
d)
none of these
6.
A phenotype that results from a dominant allele must have at least ___ dominant allele(s) present in the parent(s).
a)
one
b)
two
c)
three
d)
four
7.
Following the detection of PKU in an infant, the treatment used in order to prevent brain damage is ___.
a)
injection of missing enzymes
b)
physical therapy
c)
blood transfusions
d)
dietary adjustments
8.
A human genetic defect that results in the failure to metabolize the amino acid phenylalanine is ___.
a)
Turner syndrome
b)
Down syndrome
c)
phenylketonuria
d)
cystic fibrosis
9.
A human disorder caused by a dominant gene is ___.
a)
Tay-Sachs
b)
CF
c)
PKU
d)
Huntington's
10.
Individuals with Huntington's disease
a)
undergo progressive deterioration of the nervous system
b)
find breathing difficult and suffer lung infections
c)
must have frewuent blood transfusions
d)
suffer from aneuploidy
11.
The reason a fetus afflicted with PKU is not affected until after birth is that___.
a)
the child is not bruised or cut during development
b)
prior to birth the enzyme level of the mother prevents accumulation of the dangerous chemical
c)
the missing chromosome is compensated for by the mother
d)
because the fetus does not breathe, the accumulation of mucus in the lungs is not dangerous
12.
Choose the term that does not belong. (Be able to explain why on the quiz)
a)
genotype
b)
phenotype
c)
homozygous
d)
heterozygous
13.
Choose the one that doesn't belong. ( Be able to explain why on the test)
a)
heterozygous
b)
hybrid
c)
carrier
d)
homozygous
14.
Choose which term does not belong. ( Be able to explain why on the test.)
a)
Huntington's disease
b)
CF
c)
PKU
d)
Tay-Sachs
15.
A graphic representation of an individual's family tree is a ____.
a)
Punnet square
b)
cladogram
c)
pedigree
d)
karyotype
100 %
