Chapter 11 The Work of Gregor Mendel
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. Each pea-plant gamete has how many alleles for the height gene?
a. 1
b. 2
c. 3
d. 4
____
2. The different forms of a gene are called
a. traits.
b. pollinations.
c. alleles.
d. hybrids.
____
3. Gregor Mendel removed the male parts from the flowers of some plants in order to
a. prevent hybrids from forming.
b. prevent cross-pollination.
c. stimulate self-pollination.
d. control crosses between plants.
____
4. If a pea plant has a recessive allele for green peas, it will produce
a. green peas if it also has a dominant allele for yellow peas.
b. both green peas and yellow peas if it also has a dominant allele for yellow peas.
c. green peas if it does not also have a dominant allele for yellow peas.
d. yellow peas if it does not also have a dominant allele for green peas.
____
5. When Gregor Mendel crossed a tall plant with a short plant, the F1 plants inherited
a. one allele from each parent.
b. two alleles from each parent.
c. three alleles from each parent.
d. four alleles from each parent.
____
6. If a pea plant’s alleles for height are tt, what is true of its parents?
a. Both parents were tall.
b. Both parents were short.
c. Both parents contributed a recessive allele.
d. Both parents contributed a dominant allele.
____
7. When Gregor Mendel crossed true-breeding tall plants with true-breeding short plants, why
was it impossible to observe segregation?
a. Alleles for height do not segregate in the F2.
b. Alleles segregate only in the F2 generation.
c. Alleles segregate best when two tall plants are crossed.
d. Alleles in the F1 must be Tt to have height variety in the F2.
____
8. A tall plant (TT) is crossed with a short plant (tt). If the tall F1 pea plants are allowed to selfpollinate,
a. the offspring will be of medium height.
b. all of the offspring will be tall.
c. all of the offspring will be short.
d. the offspring can be tall or short.
____
9. In the P generation, a tall plant was crossed with a short plant. Short plants reappeared in the
F2 generation because
a. the allele for shortness becomes more common in the F2 generation.
b. the allele for shortness becomes dominant in the F2 generation.
c. the alleles for both heights segregated when the F1 plants made gametes.
d. the alleles for tallness begin to disappear in the F2 generation.
____ 10. When you flip a coin, what is the probability that it will come up tails?
a. 1
b. 1/2
c. 1/4
d. 1/8
Modified True/False
Indicate whether the statement is true or false. If false, change the identified word or phrase to make the
statement true.
____
1. A trait is a specific characteristic that can vary from one individual to another.
_________________________
____
2. True-breeding plants that produced axial flowers were crossed with true-breeding plants that
produced terminal flowers. The resulting offspring all produced terminal flowers because the
allele for terminal flowers is recessive. _________________________
____
3. During the formation of gametes in a hybrid tall plant, the tall allele and the short allele stay
together. _________________________
____
4. If the alleles for a trait did not segregate during gamete formation, offspring would always
show the trait of at least one of the parents. _________________________
____
5. The principles of probability can explain the numerical results of Mendel’s experiments.
_________________________
Completion
Complete each statement.
1. The plants that Gregor Mendel crossed to produce the F1 generation made up the
____________________ generation.
2. Due to the process of segregation, alleles separate during the production of
____________________ .
3. An organism has 38 chromosomes in a body cell. After mitosis each cell has 38
chromosomes. After meiosis each gamete has ____________________ chromosomes.
4. What is the probability of flipping a coin and getting heads 5 times in a row?
Tt
T
t
T
TT
Tt
T
TT
Tt
TT
T
=
Tall
t
=
Short
Figure 11–1
5. In the Punnett square shown in Figure 11–1, the genotypes of the offspring are
____________________.