Download ExamView - Unit 2 pracitce test.tst

Name: ________________________ Class: ___________________ Date: __________
Unit 2 practice questions
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
1. How many chromosomes are shown in a normal human karyotype?
a. 2
c. 44
b. 23
d. 46
____
2. Which of the following can be observed in a karyotype?
a. a change in a DNA base
c. genes
b. an extra chromosome
d. alleles
____
3. In humans, a male has
a. one X chromosome only.
b. two X chromosomes.
c. one X chromosome and one Y chromosome.
d. two Y chromosomes.
____
4. Human females produce egg cells that have
a. one X chromosome.
b. two X chromosomes.
c.
d.
one X or one Y chromosome.
one X and one Y chromosome.
5. In a pedigree, a circle represents a(an)
a. male.
b. female.
c.
d.
child.
adult.
____
____
6. Which of the following would you be least likely to see in a pedigree?
a. All of the symbols are unshaded.
c. All of the symbols are squares.
b. All of the symbols are shaded.
d. About half of the symbols are circles.
____
7. Which of the following genotypes result in the same phenotype?
a. IAIA and IAIB
c. IBIB and IAIB
B
B
B
b. I I and I i
d. IBi and ii
____
8. Most sex-linked genes are located on
a. the autosomes.
b. the X chromosome only.
c. the Y chromosome only.
d. both the X chromosome and the Y chromosome.
____
9. The failure of chromosomes to separate during meiosis is called
a. nondisjunction.
c. Turner’s syndrome.
b. X-chromosome inactivation.
d. Down syndrome.
____ 10. Which of the following combinations of sex chromosomes represents a female?
a. XY
c. XXXY
b. XXY
d. XX
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ID: A
Name: ________________________
ID: A
For questions 1-5 use the word bank to select the correct answer.
a. short
d. alleles
b. probalility
e. parent
c. 50%
f. 75%
11. The plants that Gregor Mendel crossed to produce the F1 generation made up the ____________________
generation.
12. The different forms of a gene are called ____________________.
13. If the allele for shortness in pea plants were dominant, all the pea plants in Mendel’s F1 generation (where he
crossed pure-breeding tall with pure-breeding short) would have been ____________________.
14. ____________________ is the likelihood that a particular event will occur.
15. If you flip a coin five times and it comes up heads each time, the probability that it will come up heads the
next time is ____________________.
Tt
T
t
T
TT
Tt
T
TT
Tt
TT
T
=
Tall
t
=
Short
Figure 11–1
16. In the Punnett square shown in Figure 11–1, the genotypes of the offspring are
a. Tall, short
b. TT, Tt ,tt
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Name: ________________________
ID: A
17. Pea plants that are TT, ____________________, or tt have different genotypes.
a. Tt
b. short
d. tall
18. When two heterozygous tall pea plants are crossed, the expected genotype ratio of the offspring is
a. 1:1
b. 1:2:1
c. 3:1
19. The principle of independent assortment states that ____________________ for different traits can segregate
independently during the formation of gametes.
a. genes
b. gametes
20. If pea plants that are homozygous for round, (RR) were crossed with pea plants that are heterozygous for
round, (Rr), the expected phenotype(s) of the offspring would be _________________________.
a. RR, Rr
b. round and wrinkled
c. all round
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Name: ________________________
ID: A
21. Crossing a pink-flowered four o’clock with a white-flowered four o’clock will produce pink-flowered
offspring and ____________________-flowered offspring.
a. red
b. white
c. cannot be determined
22. An organism’s gametes have ____________________ the number of chromosomes found in the organism’s
body cells.
a. the same
b. twice
c. half
23. Crossing-over occurs during the stage of meiosis when ____________________ form.
a. spindle fibers
b. tetrads
c. a nucleus
24. A picture that shows how many chromosomes are present in a single cell is called a _____________.
a. karyotype
b. Polaroid
c. snap-shot
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Name: ________________________
ID: A
Other
USING SCIENCE SKILLS
Figure 11–5
25. What do the letters R and I represent in Figure 11–5?
a. alleles
b. generations
26. In Figure 11–5, what is the genotype of the pink-flowered snapdragons?
a. RR
b. RI
c. II
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Name: ________________________
ID: A
27. According to Figure 11–5, if red-flowered snapdragons and ivory-flowered snapdragons are crossed, what
percentage of their offspring would be expected to be pink-flowered?
a. 25%
b. 50%
c. 100%
28. According to Figure 11–5, if two pink-flowered snapdragons are crossed, what percentage of their offspring
would be expected to be pink-flowered?
a. 25%
b. 50%
c. 100%
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Name: ________________________
ID: A
USING SCIENCE SKILLS
Figure 11–6
29.
In Figure 11–6, what is the structure labeled X in stage A?
a. tetrad
b. spindle
c. centrioles
30.
If the stages shown in Figure 11–6 are taking place in a animal, how many gametes will result from stage G?
a. two
b. four
c. one
31. In Figure 11–6, in which stages are the cells haploid?
a. at stage a
b. at stage f
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