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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
gene
B
phenotype
C
allele
D
genotype
2) A heterozygote is
A
an organism having two of the same alleles for a trait
B
an alternative form of a gene
C
a cross involving one pair of contrasting traits
D
an organism having two different alleles for a trait
3) The genetic make up of an organism is the organism's
A
heredity
B
genotype
C
phenotype
D
allele
4) Segregation of alleles occurs during
A
meiosis
B
fertilization
C
mitosis
D
pollination
5) A heterozygous individual would have the following genotype:
A
YY
B
pp
C
None of these
D
Zz
6) A trait occuring in 200 offspring out of a total of 800 offspring has a probability of
A
.25
B
0.02
C
.75
D
.50
7) In a monohybrid cross between two heterozygous parents, one would expect the offspring to be
A
3 Pp : 1 pp
B
1 pp : 3 PP
C
al 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
homozygous recessive
B
homozygous dominant
C
None of the above
D
heterozygous
9) If two parents with dominant phenotypes produce an offspring with a recessive phenotype, then probably
A
one parent is homozygous
B
one parent is heterozygous
C
both parents are homozygous
D
both parents are heterozygous
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
False
B
True
12) An organism that is homozygous for flower color could have the genotype Qq.
A
False
B
True
13) A cross involving one pair of contrasting traits is a
A
trait cross
B
dihybrid cross
C
pure cross
D
monohybrid 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 strain of short plants was not capable of pollinating the strain of tall plants
C
the short trait was controlled by a dominant factor
D
both traits were controlled by a recessive factor
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
cross pollination
B
molecular genetics
C
segregation
D
independent assortment
17) The Austrian monk that studied the heredity of pea plants and built a large foundation for genetics was
A
Gregor Mendel
B
Johann Mendeleev
C
George Mendaly
D
Greg Mendeleev
18) The appearance of an organism is its
A
phenotype
B
phenotypic ratio
C
genotype
D
genotypic ratio
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
homozygous recessive
C
heterozygous dominant
D
heterozygous 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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