AP Biology Chapter 15 practice test
Study online at https://quizlet.com/_f0hzuh
1. The chromosome theory of inheritance states that The first, second,
_____. ( Concept 15.1) and third answers
are correct.
genes occupy specific positions on chromosomes
homologous chromosomes segregate from each oth-
er during meiosis The theory en-
chromosomes assort independently during meiosis compasses these
The first and second answers are correct. three basic ele-
The first, second, and third answers are correct. ments.
2. Why did Morgan choose Drosophila for his genetics Both the second
experiments? ( Concept 15.1) and fourth an-
swers are correct.
They have a long generation time.
A single mating can produce many offspring.
They have a large number of chromosomes. The small num-
Drosophila chromosomes can be easily distinguish- ber of chromo-
able under a light microscope. somes and the
Both the second and fourth answers are correct. large number of
offspring per mat-
ing contribute to
Drosophila's use-
fulness as an ex-
perimental animal
for genetics exper-
iments.
3. Wild type refers to _____. ( Concept 15.1) :
a kind of chromosomal deletion the most common
the most extreme mutant phenotype observed in an phenotype thought
experiment to be found in the
extranuclear genes natural population
any mutant genotype
the most common phenotype thought to be found in The wild type is the
the natural population phenotype most
often seen in the
wild.
, AP Biology Chapter 15 practice test
Study online at https://quizlet.com/_f0hzuh
4. Which of the following results of Thomas Hunt Mor- Among the F2
gan's experiments with white-eyed mutant flies was progeny, only
unexpected in light of Mendelian genetics? ( Concept males had white
15.1) eyes. All of the
females had red
The mutant allele (white eyes) was recessive. eyes.
Among the F2 progeny, only males had white eyes. All
of the females had red eyes. This result was un-
The F1 flies were crossed with each other, and the F2 expected and led
progeny included red-eyed and white-eyed flies in a to the discovery of
3:1 ratio. sex-linked genes.
In the parental cross, a white-eyed male was crossed
with a red-eyed female. The F1 progeny all had red
eyes.
all of the above
5. What is the probability that a male will inherit an 0%
X-linked recessive allele from his father? ( Concept A male receives
15.2) a Y chromosome
from his father, not
0% an X.
25%
75%
50%
100%
6. In an X-linked, or sex-linked, trait, it is the contribution the mother
of _____ that determines whether a son will display
the trait. ( Concept 15.2) The son receives
his single X chro-
the paternal grandfather mosome from his
the mother mother and the Y
the father from his father.
the paternal grandmother
none of the above
7. If a mother is heterozygous for a recessive sex-linked Half of their sons
trait and her husband has the dominant allele, which will have the re-
one of the following is true about the probabilities for cessive trait.
, AP Biology Chapter 15 practice test
Study online at https://quizlet.com/_f0hzuh
their children? ( Concept 15.2)
All the sons will
All of their daughters will be heterozygous. receive Y chromo-
Half of their sons will have the recessive trait. somes from their
All of their sons will have the recessive trait. father. The X must
None of their sons will have the recessive trait. come from the het-
none of the above erozygous moth-
er; therefore, each
son has a 50%
chance of inherit-
ing the recessive
allele.
8. In werewolves (hypothetically), pointy ears (P) are 50%
dominant over round ears (p). The gene is on the X
chromosome. (Sex determination in werewolves is the The female were-
same as for "other" humans.) A certain female were- wolf must be
wolf has pointy ears even though her father had round heterozygous, be-
ears. What percentage of her sons will have round cause her father
ears if she mates with a werewolf with round ears? ( has round ears.
Concept 15.2) Each of her sons
has a 50% chance
75% of inheriting the
50% round allele.
100%
25%
0%
9. A woman is red-green color-blind. What can we con- He is red-green
clude, if anything, about her father? ( Concept 15.2) color-blind.
He is red-green color-blind. For the woman to
There is a 50% probability that he has normal vision. be affected with
We have too little information to tell. this sex-linked re-
He has two Y chromosomes. cessive trait, she
none of the above must be homozy-
gous; therefore,
she must have re-
ceived a recessive
Study online at https://quizlet.com/_f0hzuh
1. The chromosome theory of inheritance states that The first, second,
_____. ( Concept 15.1) and third answers
are correct.
genes occupy specific positions on chromosomes
homologous chromosomes segregate from each oth-
er during meiosis The theory en-
chromosomes assort independently during meiosis compasses these
The first and second answers are correct. three basic ele-
The first, second, and third answers are correct. ments.
2. Why did Morgan choose Drosophila for his genetics Both the second
experiments? ( Concept 15.1) and fourth an-
swers are correct.
They have a long generation time.
A single mating can produce many offspring.
They have a large number of chromosomes. The small num-
Drosophila chromosomes can be easily distinguish- ber of chromo-
able under a light microscope. somes and the
Both the second and fourth answers are correct. large number of
offspring per mat-
ing contribute to
Drosophila's use-
fulness as an ex-
perimental animal
for genetics exper-
iments.
3. Wild type refers to _____. ( Concept 15.1) :
a kind of chromosomal deletion the most common
the most extreme mutant phenotype observed in an phenotype thought
experiment to be found in the
extranuclear genes natural population
any mutant genotype
the most common phenotype thought to be found in The wild type is the
the natural population phenotype most
often seen in the
wild.
, AP Biology Chapter 15 practice test
Study online at https://quizlet.com/_f0hzuh
4. Which of the following results of Thomas Hunt Mor- Among the F2
gan's experiments with white-eyed mutant flies was progeny, only
unexpected in light of Mendelian genetics? ( Concept males had white
15.1) eyes. All of the
females had red
The mutant allele (white eyes) was recessive. eyes.
Among the F2 progeny, only males had white eyes. All
of the females had red eyes. This result was un-
The F1 flies were crossed with each other, and the F2 expected and led
progeny included red-eyed and white-eyed flies in a to the discovery of
3:1 ratio. sex-linked genes.
In the parental cross, a white-eyed male was crossed
with a red-eyed female. The F1 progeny all had red
eyes.
all of the above
5. What is the probability that a male will inherit an 0%
X-linked recessive allele from his father? ( Concept A male receives
15.2) a Y chromosome
from his father, not
0% an X.
25%
75%
50%
100%
6. In an X-linked, or sex-linked, trait, it is the contribution the mother
of _____ that determines whether a son will display
the trait. ( Concept 15.2) The son receives
his single X chro-
the paternal grandfather mosome from his
the mother mother and the Y
the father from his father.
the paternal grandmother
none of the above
7. If a mother is heterozygous for a recessive sex-linked Half of their sons
trait and her husband has the dominant allele, which will have the re-
one of the following is true about the probabilities for cessive trait.
, AP Biology Chapter 15 practice test
Study online at https://quizlet.com/_f0hzuh
their children? ( Concept 15.2)
All the sons will
All of their daughters will be heterozygous. receive Y chromo-
Half of their sons will have the recessive trait. somes from their
All of their sons will have the recessive trait. father. The X must
None of their sons will have the recessive trait. come from the het-
none of the above erozygous moth-
er; therefore, each
son has a 50%
chance of inherit-
ing the recessive
allele.
8. In werewolves (hypothetically), pointy ears (P) are 50%
dominant over round ears (p). The gene is on the X
chromosome. (Sex determination in werewolves is the The female were-
same as for "other" humans.) A certain female were- wolf must be
wolf has pointy ears even though her father had round heterozygous, be-
ears. What percentage of her sons will have round cause her father
ears if she mates with a werewolf with round ears? ( has round ears.
Concept 15.2) Each of her sons
has a 50% chance
75% of inheriting the
50% round allele.
100%
25%
0%
9. A woman is red-green color-blind. What can we con- He is red-green
clude, if anything, about her father? ( Concept 15.2) color-blind.
He is red-green color-blind. For the woman to
There is a 50% probability that he has normal vision. be affected with
We have too little information to tell. this sex-linked re-
He has two Y chromosomes. cessive trait, she
none of the above must be homozy-
gous; therefore,
she must have re-
ceived a recessive
