Mastering Biology Questions Chapter 9 Questions With
Complete Solutions
______ is a dominant trait, but it is also a mutant trait Correct
Answers freckles
1/3 Correct Answers Mendel was a meticulous experimentalist.
One set of crosses he performed to test his idea that a pair of
hereditary determinants segregated into gametes was to allow
self-fertilization of F2 individuals to produce F3 offspring. What
proportion of the purple-flowered F2 individuals did Mendel
predict to be true-breeding?
1/4 Correct Answers As described in the text,
hypercholesterolemia is a disorder in which blood cholesterol
levels are elevated. The H allele is incompletely dominant to the
h allele, with hh are homozvgotes havin g extremely high levels
of blood cholesterol. A husband and wife are both Hh
heterozygotes . What is the chance that their first child will have
normal levels of blood cholesterol?
1/4 Correct Answers Assume that in cattle a spotted coat is
dominant to an even coat, short horns are dominant to long
horns, and the traits for coat type and horn length assort
independently. In a cross between cattle that are each
heterozygous for both traits, what proportion of their offspring
are expected to have long horns?
2 Correct Answers There are over 100 alleles known for the
gene associated with cystic fibrosis, With current technology, it
is possible to determine exactly which allele or alleles are
,carried by a person. What is the maximum number of different
alleles that any pecson can carry?
9/64 Correct Answers In Labrador dogs, black coat is dominant
to chocolate, normal vision is dominant to progressive retinal
atrophy (PRA), and normal hip joint is dominant to hip
dysplasia. All these genes assort independently. Two dogs that
are heterozygous for alleles of all three genes are crossed. Using
rules of probability (not a Punnett square), what is the chance
that the first pup born to these dogs will be chocolate, have
normal vision, and have normal hip joints
a ___ is an inherited feature that varies from individual to
individual Correct Answers character
a ___ is one particular variation of a character Correct Answers
trait
A basic principle in biology stating that genes are located on
chromosomes and that the behavior of chromosomes during
meiosis's accounts for inheritance patters Correct Answers
chromosome theory of inheritance
A BbGg x bbgg cross yields a phenotypic ratio of approximately
5 black eyes, green skin : 5 orange eyes, white skin : 1 black
eyes, white skin : 1 orange eyes, green skin. Which of the
following best explains these results?
- the genes for eye color and skin color are co-dominant
- the heterozygous individual is male, and the homozygous
individual is female
,- Mendel's laws of segregation and independent assortment are
being violated
- Mendel's law of independent assortment is being violated
- Mendel's law of segregation is being violated Correct Answers
Mendel's law of independent assortment is being violated
A BbGg x bbgg cross yields a phenotypic ratio of approximately
5 black eyes, green skin : 5 orange eyes, white skin : 1 black
eyes, white skin : 1 orange eyes, green skin. Which of the
following best explains these results?
a) The heterozygous individual is male, and the homozygous
individual is female.
b) Mendel's laws of segregation and independent assortment are
being violated.
c) The genes for eye color and skin color are co-dominant.
d) Mendel's law of segregation is being violated.
e) Mendel's law of independent assortment is being violated.
Correct Answers e) Mendel's law of independent assortment is
being violated.
If the genes for eye color and skin color assorted independently,
then the outcome of this cross would have been a 1:1:1:1 ratio.
A BbGg x bbgg cross yields a phenotypic ratio of approximately
5 black eyes, green skin : 5 orange eyes, white skin : 1 black
eyes, white skin : 1 orange eyes, green skin. Which of the
, following best explains these results? Correct Answers mendel's
law of independent assortment is being violated
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. homozygous for the trait and able
C. homozygous for the trait and unable
D. heterozygous for the trait and able Correct Answers D,
heterozygous for the trait and able
A child with cystic fibrosis can be born to two parent who do
not have the disease. This is because the disease _______.
- is caused by a dominant allele
- is cause by a recessive allele
- requires certain environmental conditions to be expressed
- occurs in individuals who received more than one allele from
one or both parents Correct Answers is cause by a recessive
allele
A child with cystic fibrosis can be born to two parents who do
not have the disease. This is because the disease ____ Correct
Answers is caused by a recessive allele
A child with cystic fibrosis can be born to two parents who do
not have the disease. This is because the disease _____. Correct
Answers is caused by a recessive allele
Complete Solutions
______ is a dominant trait, but it is also a mutant trait Correct
Answers freckles
1/3 Correct Answers Mendel was a meticulous experimentalist.
One set of crosses he performed to test his idea that a pair of
hereditary determinants segregated into gametes was to allow
self-fertilization of F2 individuals to produce F3 offspring. What
proportion of the purple-flowered F2 individuals did Mendel
predict to be true-breeding?
1/4 Correct Answers As described in the text,
hypercholesterolemia is a disorder in which blood cholesterol
levels are elevated. The H allele is incompletely dominant to the
h allele, with hh are homozvgotes havin g extremely high levels
of blood cholesterol. A husband and wife are both Hh
heterozygotes . What is the chance that their first child will have
normal levels of blood cholesterol?
1/4 Correct Answers Assume that in cattle a spotted coat is
dominant to an even coat, short horns are dominant to long
horns, and the traits for coat type and horn length assort
independently. In a cross between cattle that are each
heterozygous for both traits, what proportion of their offspring
are expected to have long horns?
2 Correct Answers There are over 100 alleles known for the
gene associated with cystic fibrosis, With current technology, it
is possible to determine exactly which allele or alleles are
,carried by a person. What is the maximum number of different
alleles that any pecson can carry?
9/64 Correct Answers In Labrador dogs, black coat is dominant
to chocolate, normal vision is dominant to progressive retinal
atrophy (PRA), and normal hip joint is dominant to hip
dysplasia. All these genes assort independently. Two dogs that
are heterozygous for alleles of all three genes are crossed. Using
rules of probability (not a Punnett square), what is the chance
that the first pup born to these dogs will be chocolate, have
normal vision, and have normal hip joints
a ___ is an inherited feature that varies from individual to
individual Correct Answers character
a ___ is one particular variation of a character Correct Answers
trait
A basic principle in biology stating that genes are located on
chromosomes and that the behavior of chromosomes during
meiosis's accounts for inheritance patters Correct Answers
chromosome theory of inheritance
A BbGg x bbgg cross yields a phenotypic ratio of approximately
5 black eyes, green skin : 5 orange eyes, white skin : 1 black
eyes, white skin : 1 orange eyes, green skin. Which of the
following best explains these results?
- the genes for eye color and skin color are co-dominant
- the heterozygous individual is male, and the homozygous
individual is female
,- Mendel's laws of segregation and independent assortment are
being violated
- Mendel's law of independent assortment is being violated
- Mendel's law of segregation is being violated Correct Answers
Mendel's law of independent assortment is being violated
A BbGg x bbgg cross yields a phenotypic ratio of approximately
5 black eyes, green skin : 5 orange eyes, white skin : 1 black
eyes, white skin : 1 orange eyes, green skin. Which of the
following best explains these results?
a) The heterozygous individual is male, and the homozygous
individual is female.
b) Mendel's laws of segregation and independent assortment are
being violated.
c) The genes for eye color and skin color are co-dominant.
d) Mendel's law of segregation is being violated.
e) Mendel's law of independent assortment is being violated.
Correct Answers e) Mendel's law of independent assortment is
being violated.
If the genes for eye color and skin color assorted independently,
then the outcome of this cross would have been a 1:1:1:1 ratio.
A BbGg x bbgg cross yields a phenotypic ratio of approximately
5 black eyes, green skin : 5 orange eyes, white skin : 1 black
eyes, white skin : 1 orange eyes, green skin. Which of the
, following best explains these results? Correct Answers mendel's
law of independent assortment is being violated
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. homozygous for the trait and able
C. homozygous for the trait and unable
D. heterozygous for the trait and able Correct Answers D,
heterozygous for the trait and able
A child with cystic fibrosis can be born to two parent who do
not have the disease. This is because the disease _______.
- is caused by a dominant allele
- is cause by a recessive allele
- requires certain environmental conditions to be expressed
- occurs in individuals who received more than one allele from
one or both parents Correct Answers is cause by a recessive
allele
A child with cystic fibrosis can be born to two parents who do
not have the disease. This is because the disease ____ Correct
Answers is caused by a recessive allele
A child with cystic fibrosis can be born to two parents who do
not have the disease. This is because the disease _____. Correct
Answers is caused by a recessive allele
