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A gamete has one half of chromosomes of a regular body cell. T/F

True

Homologous chromosomes are two chromosomes with identical DNA sequences. T/F

False

Recent research suggests that beneficial mutations accumulate faster when species undergo sexual reproduction rather than asexual reproduction. T/F

True

During meiosis, chromosome number is reduced through three rounds of cell division. T/F

False

Sexual reproduction would be more advantageous than asexual reproduction for organisms living in an environment that is diverse and undergoes frequent changes. T/F

True

Mendel's work on garden pea plants resulted in the discovery that genetic traits of parents always blend together in subsequent generations. T/F

False

In humans, the ability to roll one's tongue is a dominant trait. Therefore, a tongue roller can only have children who are also tongue rollers. T/F

False

The separation of genes during crossing over occurs more frequently between genes that are far apart on a chromosome than for genes that are close together. T/F

True

One map unit between two genes indicates that crossing over occurs between them 100 percent of the time. T/F

False

Polyploidy is more common in plants than animals. T/F

True

Polyploid plants such as coffee and strawberries are often less healthy and smaller than diploid plants of the same species. T/F

False

During meiosis I, homologus chromosome pairs are separated when the centromeres split apart. T/F

False

Meiosis occurs during both sexual reproduction and asexual reproduction.T/F

False

Gregor Mendel's research supports the idea each organism carries a pair of alleles. T/F

True

The numbers in Figure 10-1 represent the chromosome number found in each of the dog cells shown. The processes that are occurring at A and B are ____.
a.
mitosis and fertilization
b.
meiosis and fertilization
c.
mitosis and pollination
d.
meiosis and pollination

b

A white mouse whose parents are both white produces only brown offspring when mated with a brown mouse. The white mouse is most probably ____.
a.
homozygous recessive
b.
heterozygous
c.
homozygous dominant
d.
haploid

a

In chickens, rose comb (R) is dominant to single comb (r). A homozygous rose-combed rooster is mated with a single-combed hen. All of the chicks in the F1 generation were kept together as a group for several years. They were allowed to mate only within their own group. What is the expected phenotype of the F2 chicks?
a.
100% rose comb
b.
75% rose comb and 25% single comb
c.
100% single comb
d.
50% rose comb and 50% single comb

b

In mink, brown fur color is dominant to silver-blue fur color. If a homozygous brown mink is mated with a silver-blue mink and 8 offspring are produced, how many would be expected to be silver-blue?
a.
0
b.
3
c.
6
d.
8

a

The diagram in Figure 10-2 shows a diploid cell with two homologous pairs of chromosomes. Due to independent assortment, the possible allelic combinations that could be found in gametes produced by the meiotic division of this cell are ____.
a.
Bb, Dd, BB, and DD
b.
BD, bD, Bd, and bd
c.
BbDd and BDbd
d.
Bd and bD only

b

Using Figure 10-3, which process would result in the formation of chromosome C from chromosomes A and B?
a.
asexual reproduction
b.
independent assortment
c.
crossing over
d.
segregation

c

What is the genotype of generation 1 in Figure 10-5?
a.
II
b.
Ii
c.
ii
d.
I

b

What fraction of this cross will be recessive for both traits?
a.
1/2
b.
1/4
c.
1/8
d.
1/16

d

In Figure 10-8, which set of chromatids illustrates the result of a single crossover of the homologous chromosomes?
a.
A
b.
B
c.
C
d.
D

a

In Figure 10-8, which set of chromatids will result if each chromatid crossed with a nonsister chromatid?
a.
A
c.
C
b.
B
d.
D

c

Which event during meiosis leads to a reduction in chromosome number from 2n to n?
a.
Pairs of homologous chromosomes line up at the equator.
b.
DNA undergoes replication.
c.
Homologous chromosomes travel to opposite sides of the cell.
d.
Sister chromatids are pulled apart at the centromere.

c

Crossing over would most likely occur during which stage of the cell cycle?
a.
when DNA is being replicated
b.
when homologous chromomosomes line up in pairs
c.
when centromeres are separated
d.
when cytokinesis begins

b

Which is the best description of the events that take place during anaphase II?
a.
The replicated chromosomes become visible.
b.
Homologous chromosomes line up along the equator.
c.
Sister chromatids are separated and pulled to opposite sides of the cell.
d.
Homologous pairs are separated and pulled to opposite sides of the cell.

c

What is the role of the spindle fibers?
a.
to join homologous chromosomes together
b.
to store nucleotides prior to DNA synthesis
c.
to initiate the formation of the nuclear membrane
d.
to move chromosomes in the cell

d

The typical human body cell contains 46 chromosomes. How many chromosomes are found in a typical human sperm?
a.
23
b.
45
c.
46
d.
92

a

Suppose an animal is heterozygous AaBb, and the traits are not linked. When meiosis occurs, what is the total number of possible combinations of gametes that can be made for these traits?
a.
2
b.
4
c.
6
d.
8

c

Suppose an animal is heterozygous AaBbCc, and the traits are not linked. When meiosis occurs, what is the total number of possible combinations of gametes that can be made for these traits?
a.
3
b.
6
c.
8
d.
12

c

During which phase of meiosis do homologous pairs of chromosomes line up next to one another along the equator?
a.
anaphase I
b.
metaphase I
c.
prophase II
d.
metaphase II

b

Which stage of meiosis is responsible for the law of independent assortment?
a.
metaphase I
b.
prophase I
c.
telophase I
d.
metaphase II

a

A true-breeding tall pea plant is crossed with a true-breeding short pea plant, and all the offspring are tall. What is the most likely genotype of the offspring assuming a single-gene trait?
a.
tt
b.
Tt
c.
TT
d.
TT or tt

b

In mice, black is dominant to white color and color is determined by a single gene. Two black mice are crossed. They produce 2 black offspring and one white offspring. If the white offspring is crossed with one of its parents, what percent of the offspring are expected to be white?
a.
0
b.
25
c.
50
d.
75

c

Mendel took the pollen from a tall pea plant and pollinated the flower of a short pea plant. When he did this, he removed the male parts of the flower on the short plant. Why was it important that he remove the male parts from the flower of the short plant?
a.
because he wanted to prevent self pollination
b.
because the short plant was heterozygous
c.
because he wanted to prevent the development of seeds
d.
because the short plant was not a true-breeding plant

a

Mendel crossed a true-breeding plant that produced green seeds with a true-breeding plant that produced yellow seeds to produce an F1 generation. The entire F1 generation produced yellow seeds. Then he crossed the F1 offspring with each other to produce the F2 generation. From the F2 generation, he counted 6022 yellow seeds.Which of these is the most likely estimate of the number of green seeds he collected from the F2 generation?
a.
0
b.
2000
c.
6000
d.
18000

b

A heterozygous organism is best described as which of these?
a.
dominant
b.
genotype
c.
hybrid
d.
true-breeding

c

In which situation are the phenotypes of F2 offspring expected to follow the ratio of 9:3:3:1.
a.
a monohybrid cross for 2 unlinked traits
b.
a monohybrid cross for 2 closely linked traits
c.
a dihybrid cross for 2 unlinked traits
d.
a dihybrid cross for 2 closely linked traits

c

If two heterozygous individuals are crossed, what percent of their offspring are also expected to be heterozygous?
a.
0
b.
50
c.
75
d.
100

b

Two rabbits that were homozygous for both coat and eye color were crossed. The following are the phenotypes of their F2 generation. Which most strongly suggest that the genes for eye color and coat color are linked?
a.
22 brown coat brown eye, 7 brown coat blue eye, 9 white coat blue eye, 4 white coat blue eye
b.
62 brown coat brown eye, 21 brown coat blue eye, 18 white coat blue eye, 7 white coat blue eye
c.
92 brown coat brown eye, 35 brown coat blue eye, 31 white coat blue eye, 11 white coat blue eye
d.
95 brown coat brown eye, 12 brown coat blue eye, 16 white coat blue eye, 30 white coat blue eye

d

Of the following species used in agriculture, which is most likely a polyploid?
a.
cow
b.
goat
c.
hen
d.
wheat

d

A geneticist crossed fruit flies to determine whether two traits are linked. The geneticist crossed a fly with blistery wings and spineless bristles (bbss) with a heterozygous fly that had normal wings and normal bristles (BbSs). Which results in the next generation would suggest these traits are linked?
a.
35 normal wings, normal bristles, 28 normal wings, spineless bristles, 23 blistery wings, normal bristles, 30 blistery wings, spineless bristles
b.
105 normal wings, normal bristles, 101 normal wings, spineless bristles, 111 blistery wings, normal bristles, 115 blistery wings, spineless bristles
c.
198 normal wings, normal bristles, 200 normal wings, spineless bristles, 185 blistery wings, normal bristles, 189 blistery wings, spineless bristles
d.
222 normal wings, normal bristles, 27 normal wings, spineless bristles, 22 blistery wings, normal bristles, 228 blistery wings, spineless bristles

d

Consider the cell labeled X in Figure 10-9 containing 4 chromosomes. Which of the four cells below it represents a healthy gamete that could be produced from this cell?
a.
A
b.
B
c.
C
d.
D

a

Which stage of meiosis is represented in Figure 10-10?
a.
anaphase I
b.
metaphase I
c.
anaphase II
d.
metaphase II

d

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