Practice Test - Miniunit Delta I
1. (2) The number of chromosomes found in the human sperm,
human egg, and human zygote respectively are:
a) 46, 23, 46
d) 23, 23, 46
b) 46, 46, 23
e) 46, 23, 23
c) 23, 46, 23
2. (3) One of many discrete units of heredity information
located on the chromosomes and consisting of DNA
which through interaction with internal
and external environment controls the development
of a trait.
a) gene
d) centriole
b) enzymes
e) spindle
c) nucleotides
3. (3) One of the alternative forms of the same functional
gene responsible for one of two or more
contrasting traits.
a) loci
c) alleles
b) homologs
d) chromosomes
4. (4) Which of the following genotypes represent
homozygous recessive?
a) AA
d) AB
b) aa
e) aB
c) Aa
5. (6) If a pea has green seeds and it is known that
yellow is dominant over green, then using "Y" as a
symbol, indicate ALL possible genotypes for the
"green" phenotype.
a) YY, Yy
d) Yy, yy
b) YY only
e) yy only
c) YY, yy
6. (7) What are all the possible genotype of the egg or
sperm cell from a diploid organism with the
genotype Aabb?
a) Ab, ab
d) Ab, Bb
b) Aabb
e) AB, bb
c) Ab
7. (8) Incomplete dominance (codominance), RR = red;
Rr= pink; rr= white. What would be the genotypes
of the parents when it was observed that the
F1 has 26 pink and 25 white four o'clock plants?
a) Rr and Rr
c) rr and rr
b) RR and rr
d) Rr and rr
Questions 8 & 9: A plant bearing true breeding red flowers (RR)
is crossed with another bearing true breeding white flowers (rr).
A plant bearing pink flowers is produced in the F1 generation.
This flower is allowed to self pollinate to produce F2.
8. (8-9) What proportion of "F2" will be red?
a) 100%
d) 25%
b) 75%
e) none
c) 50%
9. (8-9) What proportion of "F2" will have the genotype
Rr?
a) 100%
d) 25%
b) 75%
e) none
c) 50%
10. (10) In pea plants (YY,Yy) represents yellow seeds
and (yy) represents green seeds. A pea
plant with yellow seeds is crossed with
one of green seeds. The resulting off-
spring have about equal nembers of yellow
and green seeded plants.Give the
genotypes of the parents.
a) Yy x Yy
d) yy x yy
b) Yy x yy
e) YY x yy
c) YY x Yy
11 11. Give the genotypes of parents when both are yellow disk
shaped and produce the following offspring.
35 yellow and disk, 5 green and sphere, 9 green and disk
and 13 yellow and sphere.
a) YyDD x YyDd
d) YyDd x YyDd
b) YYDD x YYDD
e) YyDd x YYDd
c) YyDd x YyDD
12 12. It is known that a child's blood type is inherited
from the parents. Consider the case of the child
who has O-type blood when the mother has A-type and
the father has B-type blood. This can be explained
by what genetic phenomenon?
a) multiple alleles
d) monohybrid recessive
b) genetic drift
e) sex linked recessive
c) lethal genes
1
13 13. What genotypic blood type must parents have in
order to produce offspring of blood type A and
blood type O?
A o A B
a) I i x I I
A A o o
b) I I x i i
A A A o
c) I I x I i
A o A o
d) I i x I i
14-15 14. A man not having hemophilia marries a woman who also
does not have hemophilia but is known to carry the
gene for hemophilia. What are the chances that their
boys will have hemophilia?
a) 100%
d) 10%
b) 50%
e) 25%
c) 75%
17-18 15. Assume that in Drosophilia, gray body (GG,Gg)
and straight wing (SS,Ss) are dominant
over ebony (gg) and curved wing (ss).
What is the genotype of the Drosopholia
parents if a gray body straight-winged
and an ebony body straight-winged
should produce the following:
19 ebony body straight-winged
5 ebony body curved-winged
20 gray body straight-winged
7 gray body curved-winged
a) GGSS x ggss
d) GgSs x ggSs
b) GgSs x GgSs
e) Ggss x Ggss
c) GGSs x GgSs
21 16. In a population of cats it was observed that 70 percent
of the males had brown eyes and 30 percent had blue eyes;
whereas, in the females 85 percent had brown eyes and 15
percent had blue eyes. What phenomenon best explains
these results?
a) random assortment
c) linkage
b) sex linkage
d) crossing over
22 17 Consider the following crosses. A cross between two
plants that produced pink seeds produced the following
phenotype ratio: 1 white to 4 light pink to 6 pink to
4 dark pink to 1 red seed bearing plants.
What are the genotypes of the parents?
a) Rr x Rr
d) Rr R'r' x Rr R'r
b) RR r'r' x Rr r'r'
e) Rr x rr
c) Rr R'r' x rr r'r'
5 18. In fruit flies Red is dominant over white and can be
represented by RR or Rr. Red represents the---.
a) genotype
c) loci
b) phenotype
d) allel
19 19. Wheat kernal color may be white, light pink, pink,
dark pink, or red. Two seperate genes located at
different loci are responsible for this trait. This
genetic phenomenon is known as:
a) multiple allels
c) gene dominance
b) multiple genes
d) allelopathy
A B
13 20. Parents with the genotype I i x I i
produce offspring with which blood
types?
a) type A and B
c) type A,B,O
b) type A,B,AB
d) type A,B,AB,O
8 21. Assume fur color black (BB or Bb) is dominant over
brown (bb) in guinea pigs. What would be the
phenotypic ratio of the F1 if the parents are
both heterozygous black.
a) 1 black to 1 brown
b) 2 black to 1 brown
c) 3 black to 1 brown
d) 1 black to 2 brown to 1 white
9 22. In crossing homozygous dominant and homozygous
recessive garden pea plants, Mendel noted that the
presence of____genes was not apparent in the F1
generation and was apparent in only 25 percent of the
F2 generation.
a) dominant
c) lethal
b) epistatic
d) recessive
9 23. If 75 out of 100 offspring expressed dominant traits,
the parents were probably_____.
a) both homozygous dominant
b) both homozygous recessive
c) both heterozygous dominant
10 24. Use (TT or Tt) for tall and (tt) for dwarft. Which
parents would give you a 1:1 phenotype ratio?
a) Tt and tt
c) Tt and TT
b) Tt and Tt
d) both tt
10 25. Red (RR or Rr) flower color is dominant over white
(rr) flower color.. A red flowered plant was crossed
with another red flowered plant. About 25 of the
offspring were white flowered plant and 75 red
flowered plants. What is the probable genotypes of
the parents.
a) RR and rr
c) Rr and Rr
b) Rr and rr
d) Both RR
5 26. A cross between two F1 will produce:
a) P1
c) F2
b) F3
d) F4
7 27. What are all the possible genotypes of the egg or
sperm cell from a diploid organism with the genotype
AaBb?
a) AB, ab
d) Ab,Ba,ab
b) AB, AB, ab
e) AaBb
c) AB, Ab, aB, ab
4 28. Which of the following represents heterozygous
dominant?
a) AA
c) aa
b) Aa
d) AaBB
4 29. When one studies only one trait at a time is known
as:
a) multiple alleles
c) monohybrid cross
b) genetic drift
d) sex linked recessive
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Last modified October 29, 1997.