Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
|
|
|
1.
|
When
an area of a chromatid is exchanged with the matching area on a chromatid of its homologous
chromosome, _____ occurs. a. | crossing over | c. | hybridization | b. | mutagenesis | d. | fertilization | | | | |
|
|
|
2.
|
Crossing over results in a _____. a. | female genotype | c. | genetic recombination | b. | male
genotype | d. | phenotype
replication | | | | |
|
|
|
3.
|
The
_____ produced by each parent are shown along the sides of a Punnett square. a. | zygotes | c. | gametes | b. | offspring | d. | hybrids | | | | |
|
|
|
4.
|
A
useful device for predicting the possible offspring of crosses between different genotypes is the
_____. a. | law of
dominance | c. | Punnett
square | b. | law of independent assortment | d. | testcross | | | | |
|
|
|
5.
|
Which
of the following describes an organism that has the genotype Bb? a. | homozygous | c. | inbreed | b. | heterozygous | d. | all of these | | | | |
|
|
|
6.
|
Mendel's law of segregation states that during meiosis, the factors that control each
trait separate, and only _____ from each pair is/are passed to the offspring. a. | one
factor | c. | two
factors | b. | the dominant trait | d. | the recessive trait | | | | |
|
|
|
7.
|
The
law of independent assortment states that the inheritance of alleles for one trait is not affected by
the inheritance of alleles for a different trait if the genes for the traits are on
_____. a. | separate
chromosomes | c. | the same
chromosome | b. | homologous chromosomes | d. | homozygous chromosomes | | | | |
|
|
|
8.
|
The
passing on of traits from parents to offspring is called _____. a. | genetics | c. | inbreeding | b. | heredity | d. | gene splicing | | | | |
|
|
|
9.
|
The
statement: "In meiosis, the way in which a chromosome pair separates does not affect the way
other pairs separate," is another way of expressing Mendel's law of _____. a. | dominance | c. | independent
assortment | b. | first filial generations | d. | Punnett squares | | | | |
|
|
|
10.
|
Cells
containing two alleles for each trait are described as _____. a. | haploid | c. | diploid | b. | gametes | d. | homozygous | | | | |
|
|
|
11.
|
The
gamete that contains genes contributed only by the mother is _____. a. | the
sperm | c. | a
zygote | b. | an egg | d. | dominant | | | | |
|
|
|
12.
|
Pollination can best be described as _____. a. | the fusing of
the egg nucleus with the pollen nucleus | b. | the transfer of the male pollen grain to the female
organ | c. | the formation of male and female sex
cells | d. | the type of cell division that produces diploid
gametes | | |
|
|
|
13.
|
A
couple has two children, both of whom are boys. What is the chance that the parents' next child will
be a boy?
|
|
|
14.
|
A
dog's phenotype can be determined by _____. a. | looking at the dog's parents | b. | examining the
dog's chromosomes | c. | mating the dog and examining its
offspring | d. | looking at the dog | | |
|
|
|
15.
|
A
female guinea pig homozygous dominant for black fur color is mated with a male homozygous for white
fur color. In a litter of eight offspring, there would probably be _____. a. | 8 black guinea
pigs | b. | 4 black and 4
white guinea pigs | c. | 2 black, 4 gray, and 2 white guinea
pigs | d. | 8 white guinea
pigs | | |
|
|
|
16.
|
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 _____.
Figure 10-1 a. | mitosis and fertilization | c. | mitosis and pollination | b. | meiosis and
fertilization | d. | meiosis and
pollination | | | | |
|
|
|
17.
|
Genes
located on homologous chromosomes may have alternate forms that control different forms of a trait.
These alternate forms of a gene are called _____. a. | alleles | c. | phenotypes | b. | centromeres | d. | gametes | | | | |
|
|
|
18.
|
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 | c. | homozygous dominant | b. | heterozygous | d. | haploid | | | | |
|
|
|
19.
|
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 | | |
|
|
|
20.
|
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?
|
|
|
21.
|
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 _____.
Figure
10-2 a. | Bb,
Dd, BB, and DD | c. | BbDd and BDbd | b. | BD,
bD, Bd, and bd | d. | Bd and bD only | | | | |
|
|
|
22.
|
Using
Figure 10-3, which process would result in the formation of chromosome C from chromosomes A and
B?
Figure
10-3 a. | asexual
reproduction | c. | crossing
over | b. | independent
assortment | d. | segregation | | | | |
|
|
|
Figure 10-5
|
|
|
23.
|
According to Figure 10-5, the constricted pod shape is _____. a. | dominant | c. | segregated | b. | recessive | d. | hybrid | | | | |
|
|
|
24.
|
What
is the genotype of generation 1 in Figure 10-5?
|
|
|
25.
|
What
is the phenotype of generation 1 in Figure 10-5? a. | II | c. | inflated | b. | Ii | d. | constricted | | | | |
|
|
|
26.
|
What
is the genotype in the bottom left-hand quadrant in Figure 10-6?
Figure 10-6
|
|
|
Figure 10-7
|
|
|
27.
|
How
should the top row of Figure 10-7 read? a. | MMXX, MMXx, MmXX, MmXx | c. | mMXX, mMXx, mmXX, mmXx | b. | MMxX, MMxx,
MmxX, Mmxx | d. | mMxX, mMxx,
mmxX, mmxx | | | | |
|
|
|
28.
|
What
fraction of this cross will be recessive for both traits?
|
|
|
Figure 10-8
|
|
|
29.
|
In
Figure 10-8, what gametes will result if there is only a single crossover?
|
|
|
30.
|
In
Figure 10-8, what gamaetes will result if each chromatid crossed with a nonsister
chromatid?
|