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WorksheetsHuman Genetics
Total questions: 20
Worksheet time: 11mins
Name
Class
Date
1.
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.
2.
Which of the following combinations of sex chromosomes represents a female?
a)
XX
b)
XY
3.
How many chromosomes are shown in a normal human karyotype?
a)
2
b)
12
c)
25
d)
46
4.
In humans, the male has
a)
One X chromosome
b)
Two X chromosomes
c)
Two Y chromosomes
d)
One X and one Y chromosome
5.
In a pedigree the circle represents a
a)
male
b)
female
c)
child
d)
adult
6.
What is the probability that a human offspring will be female?
a)
50%
b)
25%
c)
100%
d)
75%
7.
What is the probability that a human sperm cell will carry a X chromosome?
a)
50%
b)
100%
c)
25%
d)
0%
8.
Human females produce egg cells that have
a)
2 Y chromosomes
b)
2 X chomosomes
c)
1 Y chromosome
d)
1 X chromosome
9.
What can show how a trait is passed from one generation to the next?
a)
key
b)
diagram
c)
Pedigree
d)
forecast
10.
photograph of chromosomes grouped in ordered pairs
a)
pedigree
b)
Punnett Square
c)
Venn Diagram
d)
Karyotype
11.
Chromosome that is not a sex chromosome
a)
Chromosome
b)
Autosome
c)
Sex Chromosome
d)
Homologous pair
12.
Error in meiosis in which homologous chromosomes fail to separate
a)
disjunction
b)
sex-linked recessive
c)
autosomal dominant
d)
autosomal recessive
13.
One of two chromosomes that determine and individual’s sex
a)
autosome
b)
ribosome
c)
heterozygous
d)
sex chromosome
14.
Chart that shows the relationships within a family
a)
Pedigree
b)
Karyotype
c)
T chart
d)
Key
15.
Gene located on the X or Y chromosome
a)
Homozygous dominant
b)
nondisjunction
c)
Sex-linked gene
d)
Autosomal Disorder
16.
Heterozygous
a)
Tt
b)
TT
c)
tt
d)
00
17.
Homozygous recessive
a)
TT
b)
Tt
c)
tt
d)
AA
18.
Homozygous Dominant
a)
TT
b)
Tt
c)
tt
d)
Rr
19.
Autosomes
a)
Chromosomes 1-22
b)
Sex Chromosomes
c)
Oldsmobile
d)
gamete
20.
Down Syndrome is an example of
a)
Sex-linked disorderr
b)
Autosomal disorder
c)
nondisjunction
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