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WorksheetsHuman Genetics
Total questions: 25
Worksheet time: 13mins
Name
Class
Date
1.
The inherited disease in which hemoglobin molecules clump into long fibers, changing the shape of blood cells.
a)
Cystic fibrosis
b)
Sickle Cell Disease
c)
Huntington's Disease
d)
Klinefelter's Disease
2.
Which of the following is caused by a dominant allele?
a)
Huntington's Disease
b)
Colorblindness
c)
Cystic fibrosis
d)
Sickle Cell Disease
3.
Colorblindness is more common in males than in females because
a)
Fathers pass the allele for colorblindness to their sons only
b)
The allele for colorblindness is located on the Y chromosome.
c)
The allele for colorblindness is recessive and located on the X chromosome.
d)
Males who are colorblind have two copies of the allele for colorblindness.
4.
How many chromosomes are shown in a normal human karyotype?
a)
2
b)
12
c)
25
d)
46
5.
What is the probability that a human sperm cell will carry a X chromosome?
a)
50%
b)
100%
c)
25%
d)
0%
6.
Photograph of chromosomes grouped in ordered pairs
a)
pedigree
b)
Punnett Square
c)
Venn Diagram
d)
Karyotype
7.
Chromosome that is not a sex chromosome
a)
Chromosome
b)
Autosome
c)
Sex Chromosome
d)
Homologous pair
8.
Error in meiosis in which homologous chromosomes fail to separate
a)
nondisjunction
b)
sex-linked recessive
c)
autosomal dominant
d)
autosomal recessive
9.
Chart that shows the relationships within a family
a)
Pedigree
b)
Karyotype
c)
T chart
d)
Key
10.
Autosomes
a)
Chromosomes 1-22
b)
Sex Chromosomes
c)
Oldsmobile
d)
gamete
11.
Down Syndrome is an example of
a)
Sex-linked disorderr
b)
Autosomal disorder
c)
nondisjunction
12.
What percentage of human egg cells carries an X chromosome?
a)
0%
b)
25%
c)
50%
d)
100%
13.
An example of a trait that is determined by multiple alleles.
a)
Cystic Fibrosis
b)
Colorblindness
c)
ABO Blood Type
d)
Down Syndrome
14.
If a man does not have hemophilia (X linked trait), what percentage of his daughters will have hemophilia?
a)
100%
b)
75%
c)
50%
d)
0%
15.
A boy who is colorblind inherited the disorder from his
a)
Mother
b)
Father
c)
Either Parent
d)
None of the above
16.
Which of the following genetic abbreviations denotes a male human?
a)
23,XX
b)
23,XY
c)
46,XX
d)
46,XY
17.
Humans have 23 pairs of chromosomes, 22 of the pairs are called___________.
a)
Polyploids
b)
Nondisjuction
c)
Autosomes
d)
Sex Chromosomes
18.
Which of the following pairs of genotypes result in the same phenotype?
a)
IAIA and IAIB
b)
IBIB and IBi
c)
IBIB and IAIB
d)
IBi and ii
19.
Karyotypes are useful for detecting _______.
a)
Missing or extra chromosomes
b)
All genetic disorders
c)
Cystic Fibrosis
d)
Huntington's Disease
20.
If a trait is X-linked, males pass the X-linked allele to ________ of their daughters.
a)
None
b)
1/4
c)
1/2
d)
All
21.
A person with Down syndrome has ______ copies of chromosome 21.
a)
1
b)
2
c)
3
d)
4
22.
If a couple has five boys, the probability that the next child will be a boy is _______.
a)
0%
b)
25%
c)
50%
d)
75%
23.
How are the X and Y chromosomes different?
a)
Only one is an autosome
b)
The X is smaller than the Y
c)
The Y carries fewer genes than the X
d)
Only females have Y
24.
The failure of chromosomes to separate properly during meiosis is called _______________.
a)
Nondisjuction
b)
X-chromosomes inactiviation
c)
Turner's syndrome
d)
Down syndrome
25.
The full set of genetic information in an organism's DNA.
a)
Karyotype
b)
Pedigree
c)
Genome
d)
Autosome
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