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WorksheetsCh 14 Human Heredity
Total questions: 13
Worksheet time: 10mins
Name
Class
Date
1.
What percentage of human sperm cells carry an X chromosome?
a)
0%
b)
25%
c)
50%
d)
100%
2.
A human female inherits
a)
twice as many sex chromosomes as a human male inherits
b)
one copy of every gene located on the Y chromosome
c)
two copies of every gene located on the X chromosome
d)
all of the same genes that a human male inherits
3.
Sex-linked genes are located
a)
the Y chromosome only
b)
the autosomal chromosomes
c)
the X chromosome only
d)
both the X chromosome and the Y chromosome
4.
The formation of a Barr body inactivates
a)
half of the genes on one X chromosomes in a female cell
b)
one whole Y chromosome in a male cell
c)
one whole X chromosome in a female cell
d)
one gene on one X chromosome in a male cell
5.
If the allele for having a white forelock is dominant, family members without a white forelock are
a)
heterozygous
b)
homozygous recessive
c)
trisomal
d)
homozygous dominant
6.
People who are heterozygous for sickle cell disease are generally healthy because they
a)
have some normal hemoglobin in their red blood cells
b)
are not affected by the gene until they are elderly
c)
produce more hemoglobin than they need
d)
are resistant to many different diseases
7.
The failure of chromosomes to separate during meiosis is called
a)
Down syndrome
b)
X-chromosome inactivation
c)
nondisjunction
d)
Turner's syndrome
8.
Because the X-chromosome contains genes that are vital for normal development, no baby has been born
a)
without an X chromosome
b)
with one X chromosome
c)
with 3 X chromosomes
d)
with 4 X chromosomes
9.
Colorblindness is more common in males than females because the allele for colorblindness is
a)
recessive and located on the Y chromosome
b)
recessive and located on the X chromosome
c)
dominant and located on the Y chromosome
d)
dominant and located on the X chromosome
10.
Sickle cell disease is caused by a
a)
change in the number of chromosomes in a cell
b)
change in one allele
c)
change in 2 proteins
d)
change in the size of a chromosome
11.
In cystic fibrosis, a change in a single gene causes the protein called CFTR to
a)
destroy the cell membrane
b)
fold improperly
c)
transport sodium ions
d)
become less soluble
12.
If nondisjunction occurs during meiosis,
a)
some gametes may have an extra copy of some genes
b)
only 2 gametes may form instead of 4
c)
the gamete cannot join another to form an organism
d)
the gametes redistribute chromosomes after meiosis
13.
What term is used to describe pairs of chromosomes in a karyotype?
a)
Parental
b)
Autosomal
c)
Mitosis
d)
Homologous
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