Glencoe Biology

Chapter 11: Complex Inheritance and Human Heredity

Chapter Test Practice

1
An interaction in which one allele hides the effect of another allele is called ____.
A)epistasis
B)nondisjunction
C)dosage compensation
D)sex determination
2
Down syndrome results from a (an) ____ chromosome.
A)enlarged
B)missing
C)extra
D)weak
3
Having only one of a particular type of chromosome is called ____.
A)monosomy
B)trisomy
C)trisomy 21
D)down syndrome
4
In this pedigree, which family members are carriers of Tay-Sachs?

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A)both parents
B)second and fourth offspring
C)first and second offspring
D)mother only
5
The protective caps at the end of chromosomes are called ____.
A)karyotypes
B)telomeres
C)disjunctions
D)polygenic caps
6
This Punnett square shows incomplete dominance in snap dragons. What do the Rr alleles represent?

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A)an example of codominance
B)homozygous intermediate traits
C)heterozygous intermediate traits
D)homozygous recessive traits
7
Traits such as skin color and height which result from multiple genes are called ____.
A)alleles
B)polygenic traits
C)pedigrees
D)inactive chromosomes
8
What can be performed in order to investigate what genes a parent might be carrying?
A)fetal testing
B)disease screening
C)telomeres
D)vaccination
9
What genetic condition does this table give examples of?

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A)environmental influences on chromosomes
B)normal chromosomal pairs
C)sex chromosomes that have separated abnormally
D)dosage compensation in chromosomes
10
Which of these is not an example of the environment influencing phenotype?
A)chemicals causing gene mutation
B)dry plant losing leaves
C)dog's thicker fur in cold weather
D)lack of sun causing flowers to die
11
Which statement is not true of carriers?
A)They can pass a gene for a recessive disorder.
B)They are heterozygous for a recessive disorder.
C)They express the recessive trait.
D)They have one dominant allele.
12
Which statement is true regarding sex chromosomes?
A)Males have dosage compensation.
B)Females have an X and Y chromosomes.
C)Males have two X chromosomes.
D)Females have dosage compensation.
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