Concept check
P.20
2. diploid cells have
a. two chromosomes
b. two sets of chromosomes
c. one set of chromosomes
d. two pairs of homologous chromosomes
P.25
4. which is the correct order of stages in the cell cycle?
a. G1, S, prophase, metaphase, anaphase
b. S, G1, prophase, metaphase, anaphase
c. prophase, S , G1, metaphase, anaphase
d. S, G1, anaphase, prophase, metaphase
P.32
5. which of the following events takes place in meiosis II but not meiosis I?
a. crossing over
b. contraction of chromosomes
c. separation of homologous chromosomes
d. separation of chromatids
P.35
7. A secondary spermatocyte has 12 chromosomes. How many chromosomes will be
found in the primary spermatocyte that gave rose to it?
a. 6
b. 12
c. 18
d. 24
P.36
8. which structure is diploid?
a. microspore
b. egg
c. megaspore
d. microsporocyte
P.41
22. a cell in G1 of interphase has 12 chromosomes. How many chromosomes and
DNA molecules will be found per cell when this original cell progresses to the
following stages?
a. G2 of interphase
b. metaphase I of meiosis
c. prophase of mitosis
d. anaphase I of meiosis
e. anaphase II of meiosis
f. prophase II of meiosis
g. after cytokinesis following mitosis
h. after cytokinesis following meiosis II
24. all of the following cells, shown in various stages of mitosis and meiosis, come
from the same rare species of plant. What is the diploid number of chromosomes in
this plant? Give the names of each stage of mitosis or meiosis shown.
29. a cell has 8 chromosomes in G1 of interphase. Draw a picture of this cell with its
chromosomes at the following stages. Indicate how many DNA molecules are present
at each stage.
a. metaphase of mitosis
b. anaphase of mitosis
c. anaphase II of meiosis
d. diplotene of meiosis I
32.a horse has 64 chromosomes and a donkey has 62 chromosomes. A cross
between a female horse and a male donkey produces a mule, which is usually sterile.
How many chromosomes does a mule have? Can you think of any reasons for the
fact that most mules are sterile?
35. from 80% to 90% of the most common human chromosome abnormalities arise
because the chromosomes fail to divide properly in oogenesis. Can you think of a
reason why failure of chromosome division might be more common in female
gametogenesis than in male gametogenesis?
P.45
1. which of the following factors did not contribute to Mendel’s success in his study
of heredity?
a. his use of the pea plant
b. his study of plant chromosomes
c. his adoption of an experimental approach
d. his use of mathematics
P.47
2. distinguish among the following terms: locus, allele, genotype.
P.51
4. if an F1 plant depicted in Figure 3.4 is backcrossed to the parent with round seeds,
what proportion of the progeny will have wrinkled seeds? (use a punnett square.)
a. 3/4
b. 1/2
c. 1/4
d. 0
1.一對夫妻可能生下幾種不同的孩子? 即子代兄弟姐妹的種類有幾種?