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WorksheetsGenetics Review
Total questions: 10
Worksheet time: 6mins
Name
Class
Date
1.
Mendel's early work with pea plants demonstrated a significant genetic discovery. The crossing of homozygous tall pea plants with homozygous short pea plants always resulted in tall plants and demonstrated that tallness in pea plants is a trait that is
a)
blended
b)
recessive
c)
dominant
d)
mutated
2.
Some traits are polygenic. Examples of human traits that are polygenic are skin color and height.What is a characteristic that could be used to describe all polygenic traits?
a)
They show a wide range of intermediate conditions (in the middle) between the extremes.
b)
They appear more commonly in males then in females.
c)
They are controlled by a single set of alleles.
d)
They cause diseases or disorders.
3.
Which of the following conclusions was a result of Mendel's observations?
a)
Organisms that give rise to purebreds are genetically superior.
b)
Organisms that have intermediate features are self-pollinating.
c)
Organisms inherit two copies of each gene, one from each parent.
d)
Organisms that self-pollinate do not have "either-or" features.
4.
If a pea plant were homozygous recessive for height, how would its alleles be represented?
a)
Tt
b)
TT
c)
tt
d)
tT
5.
A person who is heterozygous for a disorder caused by recessive alleles is a carrier of the disorder. A carrier is a person who
a)
does not have the disorder but can pass it on to offspring.
b)
can develop the disorder later in life but cannot pass it on.
c)
has a dominant normal allel that has been inactivated.
d)
passes the disorder to offspring on the Y chromosome only.
6.
Which statement is true of a sex-linked recessive trait?
a)
In an XY male, the recessive gene is always expressed.
b)
In and XY male, one copy is always inactivated.
c)
In an XX female, only one copy is needed for expression.
d)
In an XX female, it is always passed to offspring.
7.
Which law state that organisms inherit two copies of each gene and donate one copy to each of their offspring?
a)
law of genetic linkage
b)
law of segregation
c)
law of independent assortment
d)
law of inheritance
8.
A person who has a disorder caused by a recessive allele is
a)
considered a carrier of the disorder.
b)
homozygous for the recessive allele.
c)
unable to pass the allele to offspring.
d)
certain to have offspring with the disorder.
9.
This chart shows the results of several crosses with white-feathered chickens and dark-feathered chickens. What can be concluded about these chickens?
a)
White feathers are dominant
b)
Dark feathers are dominant.
c)
White and dark feathers show incomplete dominance.
d)
White and dark feathers are codominant
10.
For an XX female to express a recessive sex-linked trait, she must have
a)
a Y chromosome.
b)
an inactivated allele.
c)
two recessive alleles.
d)
two dominant alleles.
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