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Chapter 9 Test
Test Description: Test Review
Instructions: Answer all questions to get your test result.
1) Female inheritance patterns cannot be analyzed by simply studying the X chromosome because
A
the X chromosome is too large to analyze effectively
B
one X chromosome is deactivated in females.
C
the X chromosome sometimes exchanges genetic information with the Y chromosome
D
the X chromosome is obtained from both father and mother.
2) Any gene located on a sex chromosome
A
is called a recessive gene.
B
will exhibit pleiotropy.
C
is called a sex-linked gene.
D
will exhibit codominance.
3) The mechanism that breaks the linkage between linked genes is
A
pleiotropy.
B
independent assortment.
C
codominance.
D
crossing over.
4) A person with AB blood illustrates the principle of
A
incomplete dominance.
B
codominance
C
pleiotropy.
D
polygenic inheritance.
5) A carrier of a genetic disorder who does not show symptoms is most likely to be ________ to transmit it to offspring.
A
heterozygous for the trait and unable
B
heterozygous for the trait and able
C
homozygous for the trait and able
D
homozygous for the trait and unable
6) A testcross is
A
a mating between an individual of unknown genotype and an individual homozygous recessive for the trait of interest.
B
a mating between two individuals of unknown genotype.
C
a mating between an individual of unknown genotype and an individual heterozygous for the trait of interest.
D
a mating between two individuals heterozygous for the trait of interest.
7) Mendel's law of independent assortment states that
A
independent sorting of genes produces polyploid plants under some circumstances.
B
chromosomes sort independently of each other during mitosis and meiosis.
C
each pair of alleles segregates independently of the other pairs of alleles during gamete formation.
D
genes are sorted concurrently during gamete formation.
8) A monohybrid cross is
A
a breeding experiment in which the parental varieties have only one trait in common.
B
the second generation of a self-fertilized plant.
C
a breeding experiment in which the parental varieties differ in only one character.
D
a breeding experiment in which the parental varieties have only one prominent trait.
9) Varieties of plants in which self-fertilization produces offspring that are identical to the parents are referred to as
A
true-breeding.
B
monohybrid crosses.
C
the F2 generation.
D
hybrids.
10) ________________ is the scientific study of heredity.
A
Pedigree
B
Selective breeding
C
Genetics
D
True-breeding
11) This person is known as the father of genetics.
A
Gregor Mendel
B
Hippocrates
C
Aristotle
D
Pangenesis
12) True-breeding parental plants are the
A
P generation
B
hybrids
C
F1 generation
D
F2 generation
13) Referring to Mendel's pea plant experiments, the hybrid offspring are the
A
F2 generation
B
purebreds
C
F1 generation
D
P generation
14) A cross of F1 plants produces an
A
F2 generation
B
F1 generation
C
P generation
D
all purebred offspring
15) ___________ is the mating between an individual of unknown genotype and a homozygous recessive individual.
A
selective breeding
B
true-breeding
C
punnett square
D
testcross
16) A dihybrid cross should produce the following phenotypic ratio:
A
9:3:3:1
B
8:4:2:2
C
3:1
D
1:1:1:1
17) This shows the four possible combinations of alleles that could occur when these gametes combine.
A
genotype
B
phenotype
C
punnett square
D
law of independent assortment
18) A heritable feature that varies among individuals, such as flower color is
A
a genotype
B
dominant
C
a trait
D
a character
19) Each variant for a character, such as purple or white flowers is
A
genotype
B
a trait
C
dominant
D
a characteristic
*select an answer for all questions
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