Practice Test
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3Name: ________________________ Class: ___________________ Date: __________
ID: A
Chapter 7 Practice
1. Most of the traits expressed in a person's phenotype
6. Unlike the traits studied by Mendel, most traits are
are determined by
produced by genes with
a.
Y chromosomes.
a.
sex linkage.
b.
X chromosome inactivation.
b.
only one allele.
c.
autosomal genes.
c.
dominance and recessiveness.
d.
sex chromosomes.
d.
multiple alleles.
2. Which of the following phrases is true of X
7. A plant that is homozygous for red flowers is
chromosome inactivation?
crossed with a plant that is homozygous for white
a.
affects fewer genes than Y chromosome
flowers. In the case of incomplete dominance, the
expression
flowers of the offspring will be
b.
occurs in cells of female mammals
a.
red and white.
c.
disables some chromosomes in cells of male
b.
white only.
mammals
c.
pink only.
d.
determines phenotype in male mammals
d.
red only.
3. A person who is heterozygous for a disorder caused
8. In the case of codominant alleles, a plant that is
by recessive alleles is a carrier of the disorder. A
homozygous for red flowers that is crossed with a
carrier is a person who
plant that is homozygous for white flowers will
a.
does not have the disorder but can pass it on to
produce flowers that are
offspring.
a.
red and white spotted.
b.
can develop the disorder later in life but cannot
b.
completely white.
pass it on.
c.
dark pink all over.
c.
has a dominant normal allele that has been
d.
pink and red.
inactivated.
9. Eye color, hair color, and skin color are polygenic
d.
passes the disorder to offspring on the Y
traits. Polygenic traits result from
chromosome only.
a.
recessive genes.
4. Genes that are located on sex chromosomes are
b.
many genes.
called
c.
codominant genes.
a.
alleles.
d.
epistatic genes.
b.
recessive.
10. Identical twins who are raised apart can have
c.
XY.
differences that last a lifetime. This is evidence that
d.
sex-linked.
a.
phenotype differences happen through epistatic
5. Which statement is true of a sex-linked recessive
genes.
gene?
b.
genotype can change over time.
a.
In an XY male, this recessive gene is always
c.
environment and genotype interact to affect
expressed.
phenotype.
b.
In an XY male, one copy is always inactivated.
d.
codominance affects genotype.
c.
In an XX female, only one copy is needed for
expression.
d.
In an XX female, it is always passed to
offspring.
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