Download Exam 4 Review - Iowa State University

Worksheet:
Exam 4 Review
Supplemental Instruction
Iowa State University
Leader:
Course:
Instructor:
Date:
Kelly
Biol 211 (3)
Biederman
3/22/16
1.) If a species has a 2n number of chromosomes = 16 then which of the following is true?
A) The species is diploid with 32 chromosomes per cell
B) A gamete from this species contains 4 chromosomes
C) Each cell has 8 homologous pairs
D) The species has 16 sets of chromosomes per cell
E) None of the above
Follow up:
2.) Which of the following occurs in meiosis but not mitosis?
A) chromosome replication
B) synapsis of chromosomes
C) production of daughter cells
D) alignment of chromosomes at the center of cell
E) condensation of chromatin
3.) A human cell containing 22 autosomes and a Y chromosome is a
A) egg
B) zygote
C) sperm
D) a male somatic cell
E) a female somatic cell
4.) Which of the following happens at the conclusion of meiosis I?
A) homologous chromosomes are separated
B) the chromosome number per cell is conserved
C) sister chromatids are separated
D) four daughter cells are formed
E) the sperm cell fertilizes the egg
5.) A cross between a homozygous purple flowered and a homozygous white flowered pea plants results
in offspring with purple flowers. This demonstrates
A) blending inheritance
B) true breeding traits
C) dominance of one trait over another
D) a di-hybrid cross
E) a mistake by Mendel
6.) When you cross an organism that is homozygous recessive for a trait with one that is a heterozygote
for the same trait, what is the chance of producing homozygous recessive offspring?
A) 0%
B) 25%
C) 50%
D) 75%
E) 100%
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7.) The rare llama-rabbit is known to have 2 traits: head shape (H) and tail length (T) that are controlled
by un-linked genes. The genotype of a stud-male llama-rabbit is HhTt. Which of the following is a
possible genotype found in his gametes?
A) HT
B) Hh
C) HhTt
D) Tt
E) H
8.) An organisms appearance or observable traits are referred to as its
A) genotype
B) phenotype
C) character
D) trait
E) dominant allele
9.) Red-green color blindness in humans is a sex-linked recessive trait. A husband and a wife with
normal vision have a color-blind son. What are the genotypes of the parents?
A) Xc Xc and XcY
B) Xc Xc and XCY
C) XC XCand XcY
D) XC XC and XCY
E) XC Xc and XCY
The Mitotic Cell Cycle:
H





Label each letter
What is happening to
the chromosomes at
each step?
If letter (I) was
added, what might it
represent?
What letters =
Interphase? Mitosis?
How would a circular
representation of
meiosis differ?
Is binary fission more
similar to mitosis or
meiosis?
Compare and Contrast:
Mitosis:
Meiosis:
What stage do they both start out in?
What events are unique to this type of cell division?
What events/structures are unique to this type of cell
division?
What is the purpose of this type of cell division?
What is the purpose of this type of cell division?
Final Product in humans: (Number cells? Ploidy? Relation
to original cell?)
Final Product in humans: (Number? Ploidy? Relation to
original cell?)
What human cells does this process produce? How
many autosomes/sex chromosomes?
What human cells does this process produce? How
many autosomes/ sex chromosomes?
What problems can arise?
What problems can arise?
Is genetic variation introduced? How?
Is genetic variation introduced? How?
For a good animated overview of Mitosis and Meiosis visit: vcell.ndsu.nodak.edu/animations
Briefly describe the difference between the following:
Genotype vs. Phenotype?
Gene vs. Loci vs. Allele?
Dominant allele vs. Recessive allele?
Homozygous vs. Heterozygous?
Are the following homozygous or heterozygous? How many gametes could each produce?
HH
Rr
EeGG
TtAa
RrHHTT
Punnett Square practice:
1. Albinism (lack of skin pigmentation) is caused by a recessive autosomal allele. Persons who are
heterozygous for albinism are carriers. Persons who are homozygous recessive have the disease. If a
person who does not have the disease and is not a carrier marries a carrier for the disease, what is the
chance they will have a child with the disease? What is the chance they will have a child who is a carrier?
Show the Punnett square to support your answer.
What are the parental genotypes: Are they hetero/homozygous?
How many different gametes can each parent produce:
2. You have a dog that is homozygous recessive at locus (A) and has light fur. She has 8 puppies that all
express dark fur color. What is most likely the genotype of the father? Show the Punnett square to
support your answer.
What are the parental genotypes: Are they hetero/homozygous?
How many different gametes can each parent produce:
3.
Sex linked: If the mother is a carrier for colorblindness XCB then what ratio of her children
will be colorblind? (The father is not colorblind.)
4. Dihybrid Crosses:
P: GGDD x ggdd
F1:
F2 (from F1 self):
Linkage vs. unlinked?
What causes two genes to be linked?
Given 2000 offspring, that would mean 500 of each of these phenotypic classes.
Say you make this mating, and your actual results look like this:
Long Green - 850
Long Blue - 150
Short Green - 150
Short Blue - 850
What is it?
Polygenic Inheritance
Incomplete Dominance
Examples?