MESA COLLEGE, SAN DIEGO
School of Mathematics & Natural Sciences
General Biology Lecture (BIOL 107): Instructor: Elmar Schmid, Ph.D.
QUIZ #7
GENETICS

Answer the following questions and mark it on a Scantron 882-E answer sheet. All
questions of this “open textbook-open notes” quiz must be answered by the student
without help by class mates, friends or other human beings. Please read the following
statement below carefully and sign it if you satisfy the guidelines outlined in this statement.
This signed take home exercise sheet must be turned in with your answer sheet to receive
full credit for this assignment. This assignment is due at the first class meeting the
following week.

I HAVE ANSWERED THE QUESTIONS IN THIS EXERCISE ON MY OWN. I DID NOT CONSULT OTHERS
OR IN ANY CONDUCT IN ANY ACTIVITITES THAT COULD BE CONSTRUED AS CHEATING IN THIS
ASSIGNMENT. I DID NOT MAKE ANY COPIES OF THIS ASSIGNMENT.
_________________________________
(PRINT YOUR NAME)
________________________________
(YOUR SIGNATURE)
Q. 1: Which of the following researchers discovered fundamental principles of inheritance by
performing breeding experiments with plants?
A) J. Watson and F. Crick
B) Friedrich Miescher
C) Hans Krebs
D) Thomas Morgan
E) Gregor Mendel
Q. 2: In the 1860s, Gregor Mendel performed repeated self-fertilization experiments with
_________________ plants to generate _________________ varieties.
A) orchids … genetically uniform
B) garden pea … genetically uniform
C) garden pea … true-breeding
D) snap dragons … true-breeding
E) lilies … more colored
Q. 3: A dihybrid cross in genetics means
A) the second generation of a self-fertilized plant
B) a breeding experiment in which the parental varieties have two traits in common
C) a breeding experiment in which parental varieties differ regarding two heritable traits
D) a triploid plant that results from breeding two very different plants
E) none of the above
Q. 4: An organism with two identical alleles for a single heritable trait is said to be
A) genotypically similar
B) heterozygous
C) homozygous
D) segregated
E) cross-fertilized
Q. 5: The physical/visible heritable traits of an organism are referred to as its expressed form.
A) True
B) False
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MESA COLLEGE, SAN DIEGO
School of Mathematics & Natural Sciences
General Biology Lecture (BIOL 107): Instructor: Elmar Schmid, Ph.D.
Q. 6: A farmer crosses a corn plant with solely purple kernels with a true-bred yellow corn
variety and observed that none of the kernels of the following corn generation are yellow. He
concludes, that the corn plant with the purple kernels
A) was homozygous dominant regarding the purple kernel allele P
B) was heterozygous (genotype Pp)
C) was homozygous regarding the yellow kernel allele p
D) that kernel color in corn plants is NOT a heritable trait
Q. 7: A healthy woman whose mother died from cystic fibrosis marries a man heterozygous
regarding the cystic fibrosis allele. What is the chance for this couple that they will have a child
that will be diagnosed with cystic fibrosis?
A) 100%
B) 50%
C) 25%
D) not possible (0%)
Q. 8: A heterozygous yellow seed-colored pea plant is crossed with a green seed-colored pea plant.
What is the probability “p” that one of the offspring will have green seeds?
A) 0
B) 0.25
C) 0.5
D) 0.75
E) 1.0
Q. 9: A red-colored snap dragon plant is crossed with a white-colored snap dragon plant. All F1
offspring plants show pink-colored petals. This observation is a classical example of ______ in
genetics.
A) blending
B) co-dominance
C) incomplete dominance
D) Mendelian inheritance
E) dihybrid cross
Q. 10: You are carefully following up the family history of breast cancer. Your pedigree
investigation reveals that one or two female family members of every generation were diagnosed
with breast cancer at some point in their lives. You conclude, that:
A) the disease is inherited in a recessive manner
B) the disease is inherited in a dominant manner
C) the disease is inherited in an X-linked fashion
D) the disease is contagious and runs in the family
Q. 11: A woman who grew up in an orphanage is (unknowingly) heterozygous regarding the
albinism allele. She marries a “non-albino” man with no family history of albinism. What is the
chance “p” that one of the couples’ children will be born as an albino?
A) 0.1
B) 0.25
C) 0.5
D) 1.0
E) not a chance
Q. 12: A pea plant which is heterozygous tall and heterozygous round (smooth) seeded is crossed
with a dwarf plant which has wrinkled seeds. Which of the following would be the genotype(s) of
the F1 generational offspring (Tall and Round are dominant traits)?
A) all TtSs
B) TtSS; Ttss and TtSs
C) TtSs, Ttss, ttSs and ttss
D) TtSS, TtSs, and ttSs
E) ttSS, Ttss and TTss
Q. 13: What percentage of the offspring of the breeding experiment of Q. 12 will be tall plants
with wrinkled seeds?
A) 0%
B) 25%
C) 50%
D) 75%
E) all of them (100%)
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MESA COLLEGE, SAN DIEGO
School of Mathematics & Natural Sciences
General Biology Lecture (BIOL 107): Instructor: Elmar Schmid, Ph.D.
Q. 14: How many sex chromosomes are in a single human somatic cell?
A) one
B) two
C) three
D) four
E) 22
Q. 15: Since the behavior of chromosomes during meiosis accounts for the inheritance pattern of
Mendel’s factors, which process during meiosis is responsible for Mendel’s observation of
independent assortment of alleles?
A) Interphase
B) Metaphase I
C) Anaphase I
D) Metaphase II
E) Anaphase II
Bonus Q.: What is the normal complement of sex chromosomes in a human female?
A) two X chromosomes
B) two Y chromosomes
C) two X chromosomes and one Y chromosome
D) one X chromosome and one Y chromosome
E) one Y chromosome
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MESA COLLEGE, SAN DIEGO
SCHOOL OF MATHEMATICS & NATURAL SCIENCES
General Biology Lecture (BIOL 107); Instructor: Elmar Schmid, Ph.D.
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