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Genetics
Test Description: Chapter 9 Test Review
Instructions: Answer all questions to get your test result.
1) A segment of DNA that controls a particular hereditary trait is a
A
genotype
B
gene
C
allele
D
phenotype
2) A heterozygote is
A
an organism having two different alleles for a trait
B
a cross involving one pair of contrasting traits
C
an alternative form of a gene
D
an organism having two of the same alleles for a trait
3) The genetic make up of an organism is the organism's
A
allele
B
heredity
C
genotype
D
phenotype
4) Segregation of alleles occurs during
A
mitosis
B
pollination
C
fertilization
D
meiosis
5) A heterozygous individual would have the following genotype:
A
pp
B
Zz
C
None of these
D
YY
6) A trait occuring in 200 offspring out of a total of 800 offspring has a probability of
A
.25
B
.75
C
0.02
D
.50
7) In a monohybrid cross between two heterozygous parents, one would expect the offspring to be
A
al Pp
B
3 Pp : 1 pp
C
1 pp : 3 PP
D
1 PP : 2 Pp : 1 pp
8) In guinea pigs, black fur is dominant. A black guinea pig is crossed with a white guinea pig. If the litter contains a white offspring, the genotype of the black-haired parent is probably
A
None of the above
B
heterozygous
C
homozygous recessive
D
homozygous dominant
9) If two parents with dominant phenotypes produce an offspring with a recessive phenotype, then probably
A
both parents are homozygous
B
both parents are heterozygous
C
one parent is heterozygous
D
one parent is homozygous
10) Suppose you have found a new species of plant. Some of the plants have yellow flowers, and some have red flowers. You cross a red-flowering plant with a yellow-flowering plant. All of the offspring have orange flowers. What genotype is the offspring?
A
rr
B
Rr
C
R'R'
D
RR
11) Offspring of the P1 generation are called F2 generation.
A
True
B
False
12) An organism that is homozygous for flower color could have the genotype Qq.
A
True
B
False
13) A cross involving one pair of contrasting traits is a
A
monohybrid cross
B
trait cross
C
pure cross
D
dihybrid cross
14) Incomplete dominance is shown when
A
a black guinea pig is crossed with a white quinea pig to produce a black guinea pig.
B
a black guinea pig is crossed with a white quinea pig to produce a grey guinea pig.
C
a black guinea pig is crossed with a white quinea pig to produce a speckled black and white guinea pig.
D
a black guinea pig is crossed with a white quinea pig to produce a white guinea pig.
15) When Medel crossed a strain of tall pea plants with a strain of short pea plants, he observed that all of the plants in the F1 generation were all tall. This suggests
A
both traits were controlled by a recessive factor
B
the short trait was controlled by a dominant factor
C
the tall trait was controlled by a dominant factor
D
the strain of short plants was not capable of pollinating the strain of tall plants
16) When alleles for different characteristics are on separate chromosomes, they are distributed to gametes independently. This observation is summarized by the law of
A
segregation
B
cross pollination
C
independent assortment
D
molecular genetics
17) The Austrian monk that studied the heredity of pea plants and built a large foundation for genetics was
A
George Mendaly
B
Greg Mendeleev
C
Gregor Mendel
D
Johann Mendeleev
18) The appearance of an organism is its
A
phenotype
B
phenotypic ratio
C
genotypic ratio
D
genotype
19) To determine the genotype of an individual that shows the dominant phenotype, you would cross the individual with one that is
A
homozygous dominant
B
heterozygous recessive
C
heterozygous dominant
D
homozygous recessive
20) In a dihybrid cross between an individual with the genotype RRYY and an individual with the genotype rryy, all of the offspring will have the genotype
A
RrYy
B
rryy
C
RrYY
D
RRYY
*select an answer for all questions
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