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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
allele
B
gene
C
genotype
D
phenotype
2) A heterozygote is
A
an organism having two of the same alleles for a trait
B
an alternative form of a gene
C
an organism having two different alleles for a trait
D
a cross involving one pair of contrasting traits
3) The genetic make up of an organism is the organism's
A
phenotype
B
heredity
C
allele
D
genotype
4) Segregation of alleles occurs during
A
mitosis
B
pollination
C
fertilization
D
meiosis
5) A heterozygous individual would have the following genotype:
A
Zz
B
pp
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
.75
B
0.02
C
.25
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 : 2 Pp : 1 pp
D
1 pp : 3 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 dominant
D
homozygous recessive
9) If two parents with dominant phenotypes produce an offspring with a recessive phenotype, then probably
A
one parent is heterozygous
B
both parents are heterozygous
C
one parent is homozygous
D
both parents are 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
rr
D
R'R'
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
dihybrid cross
B
trait cross
C
monohybrid cross
D
pure cross
14) Incomplete dominance is shown when
A
a black guinea pig is crossed with a white quinea pig to produce a grey guinea pig.
B
a black guinea pig is crossed with a white quinea pig to produce a speckled black and white guinea pig.
C
a black guinea pig is crossed with a white quinea pig to produce a black 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
the tall trait was controlled by a dominant factor
B
the short trait was controlled by a dominant factor
C
both traits were controlled by a recessive 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
molecular genetics
B
independent assortment
C
segregation
D
cross pollination
17) The Austrian monk that studied the heredity of pea plants and built a large foundation for genetics was
A
Johann Mendeleev
B
Gregor Mendel
C
Greg Mendeleev
D
George Mendaly
18) The appearance of an organism is its
A
phenotype
B
genotype
C
genotypic ratio
D
phenotypic ratio
19) To determine the genotype of an individual that shows the dominant phenotype, you would cross the individual with one that is
A
heterozygous dominant
B
heterozygous recessive
C
homozygous 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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