Chapter 9 Test Question Preview (ID: 36952)


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Female inheritance patterns cannot be analyzed by simply studying the X chromosome because
a) the X chromosome is obtained from both father and mother.
b) the X chromosome is too large to analyze effectively
c) the X chromosome sometimes exchanges genetic information with the Y chromosome
d) one X chromosome is deactivated in females.

Any gene located on a sex chromosome
a) will exhibit codominance.
b) is called a sex-linked gene.
c) will exhibit pleiotropy.
d) is called a recessive gene.

The mechanism that breaks the linkage between linked genes is
a) independent assortment.
b) codominance.
c) pleiotropy.
d) crossing over.

A person with AB blood illustrates the principle of
a) pleiotropy.
b) polygenic inheritance.
c) codominance
d) incomplete dominance.

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 able
b) homozygous for the trait and unable
c) homozygous for the trait and able
d) heterozygous for the trait and unable

A testcross is
a) a mating between two individuals heterozygous for the trait of interest.
b) a mating between an individual of unknown genotype and an individual homozygous recessive for the trait of interest.
c) a mating between two individuals of unknown genotype.
d) a mating between an individual of unknown genotype and an individual heterozygous for the trait of interest.

Mendel's law of independent assortment states that
a) independent sorting of genes produces polyploid plants under some circumstances.
b) each pair of alleles segregates independently of the other pairs of alleles during gamete formation.
c) chromosomes sort independently of each other during mitosis and meiosis.
d) genes are sorted concurrently during gamete formation.

A monohybrid cross is
a) a breeding experiment in which the parental varieties differ in only one character.
b) the second generation of a self-fertilized plant.
c) a breeding experiment in which the parental varieties have only one trait in common.
d) a breeding experiment in which the parental varieties have only one prominent trait.

Varieties of plants in which self-fertilization produces offspring that are identical to the parents are referred to as
a) the F2 generation.
b) monohybrid crosses.
c) hybrids.
d) true-breeding.

________________ is the scientific study of heredity.
a) Genetics
b) Selective breeding
c) True-breeding
d) Pedigree

This person is known as the father of genetics.
a) Aristotle
b) Gregor Mendel
c) Hippocrates
d) Pangenesis

True-breeding parental plants are the
a) P generation
b) F1 generation
c) F2 generation
d) hybrids

Referring to Mendel's pea plant experiments, the hybrid offspring are the
a) P generation
b) F1 generation
c) F2 generation
d) purebreds

A cross of F1 plants produces an
a) P generation
b) F1 generation
c) F2 generation
d) all purebred offspring

___________ is the mating between an individual of unknown genotype and a homozygous recessive individual.
a) testcross
b) punnett square
c) true-breeding
d) selective breeding

A dihybrid cross should produce the following phenotypic ratio:
a) 9:3:3:1
b) 3:1
c) 1:1:1:1
d) 8:4:2:2

This shows the four possible combinations of alleles that could occur when these gametes combine.
a) phenotype
b) genotype
c) punnett square
d) law of independent assortment

A heritable feature that varies among individuals, such as flower color is
a) a trait
b) a character
c) a genotype
d) dominant

Each variant for a character, such as purple or white flowers is
a) a trait
b) a characteristic
c) genotype
d) dominant

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