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Quiz #9- BIO 100
1
Crossing over:
a.
means that sister chromatids will have identical alleles.
b.
occurs between nonsister chromatids.
c.
happens during metaphase I.
d.
happens during prophase II.
2
Aside from crossing over, how many unique combinations are possible in the gametes of an
organism with 12 pairs of homologous chromosomes?
a.
1223
b.
2 x 12
c.
212
d.
122
3
Unequal cytoplasmic divisions are characteristic of:
a.
mitosis.
b.
spermatogenesis.
c.
all of the choices.
d.
oogenesis.
4
The chromosome number of a human sperm cell is:
a.
half that of a kidney cell.
b.
twice that of a kidney cell.
c.
half that of an ovum.
d.
twice that of an ovum.
5
In aphids, the main advantage of sexual reproduction is that:
a.
it produces genetic variation in traits.
b.
all of the choices.
c.
it allows population size to increase more rapidly.
d.
it occurs at any time of the year, not only in spring.
6
In flowering plants, male gametes arise in the:
a.
anther.
b.
ovules.
c.
ovary.
d.
pistil.
7
Plant spores:
a.
are haploid resting cells.
b.
originate in sporophytes.
c.
undergo mitosis to form gametophytes.
d.
all of the choices.


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8
A primary sporophyte:
a.
develops from a diploid zygote.
b.
is usually haploid.
c.
all of the choices.
d.
produces gametes by meiosis.
9
All female animals require males to participate in the production of offspring.
TRUE
FALSE
10
Unlike mitosis, meiosis:
a.
has two cell divisions.
b.
all of the choices.
c.
does not make exact copies of the original cell.
d.
favors crossing over.
11
Chromosomes that have the same length, shape and gene assortment are:
a.
homologous chromosomes.
b.
alleles.
c.
gametes.
d.
nonsister chromatids.