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SBI3U1
UNIT TEST 3: GENETICS
Name:____________________
PART I: Multiple Choice (30 Marks) **ANSWER SHEET ON THE BACK**
1. The products of meiosis I are:
a. Diploid
b. Haploid
c. Imploid
d. Deeploid
2. The products of meiosis II are:
a. Diploid
b. Haploid
c. Imploid
d. Deeploid
3. In a dihybrid problem, the dimensions of a Punnett’s square are determined by:
a. The number of traits
b. The number of gametes
c. The number of possible gamete combinations
d. The number of alleles
4. In a monohybrid cross showing complete dominance, the phenotypic ratio would
be:
a. 3:1
b. 2:2
c. 0:4:0
d. 1:2:1
5. A statement must include which of the following information:
a. Species, Generation, Trait, Phenotypic Ratio
b. Species, Genus, Trait, Genotypic Ratio
c. Species, Generation, Trait, Genotypic Ratio
d. Species, Method of Reproduction, Trait, Phenotypic Alleles
6. A test cross is performed by crossing a dominant individual with an unknown
genotype with…
a. a heterozygote
b. a homozygous dominant individual
c. a homozygous recessive individual
d. a dominant individual of unknown genotype
7. In a dihybrid cross of two individuals that are heterozygous for both traits being
analyzed, the phenotypic ratio expected would be:
a. 3:1
b. 1:2:1
c. 9:3:3:1
d. 2:2
8. How many possible phenotypes are there for someone with type A blood?
a. 1
b. 2
c. 3
9. The organelles and other components of the cell (other than the nucleus)
reproduce during:
a. Prophase
b. Metaphase
c. Cytokinesis
d. Telophase
10. In this stage of cell division, homologous pairs are lined up at the equator:
a. Prophase
b. Metaphase
c. Anaphase
d. Telophase
11. In this phase, the cell prepares for mitosis:
a. G1 Phase
b. S Phase
c. G2 Phase
d. A Phase
12. In a cross between a carrier of PKU (autosomal recessive) and a person with the
disease the percent chance they will have an affected child is:
a. 0%
b. 25%
c. 50%
d. 100%
13. Huntington’s disease is an autosomal dominant disorder. In a cross between a
person affected with the disease (but whose mother did not have the disease) and a
person who is homozygous for the trait, the chance of having an affected child is:
a. 0%
b. 25%
c. 50%
d. 100%
14. In a cross between a man affected with haemophelia (X-linked, recessive) and a
normal woman with no family history of haemophelia, the chance of having an
affected son would be:
a. 0%
b. 25%
c. 50%
d. 100%
15. Which of the following is a characteristic of a sex linked pedigree?
a. Skips generations
b. No father to son transmission
c. Two heterozygotes produce 75% affected offspring
d. Only affected people pass on the trait
16. In a test cross that produces a 50:50 ratio of dominant to recessive phenotypes,
the unknown subject was:
a. Heterozygous
b. Homozygous dominant
c. Homozygous recessive
d. Replaced with instant coffee
17. Crossing a brown hamster with a white hamster to produce a white hamster is
an example of:
a. Co-dominance
b. Incomplete dominance
c. Complete dominance
d. Poor pet care
18. Which chromosome has more genes?
a. The X chromosome
b. The Y chromosome
c. They have the same number
d. I love lamp
19. Which of these is NOT an advantage of asexual reproduction?
a. It’s fast
b. It doesn’t require special reproductive structures
c. It increases diversity in a population
d. It conserves energy
20. Why do lizards in the desert undergo parthenogenesis?
a. Mates are hard to find in the desert
b. It’s too hot for mating
c. Asexual reproduction is faster and easier d. This kind of reproduction is preferred to mating with a male
21. If you express dimples (Dominant) but your father does not have dimples, this
means:
a. Your genotype is dd
b. Your genotype is Dd
c. Your genotype is DD
d. You’re D.D. for the party
22. If brown eyes are dominant to blue eyes, and there are no exceptions to this rule,
two people who have blue eyes can only have children with blue eyes.
a. True
b. False
23. In a dihybrid problem, two traits are examined at the same time, but one trait is
not related to the other. This is an example of:
a. Mendel’s law of independent assortment
b. Mendel’s law of segregation
24. In a cross between two heterozygous purple pea plants, 1/4 of the offspring will
be white. This is because:
a. The plants still carry the gene for the recessive trait, it just isn’t expressed
b. Genes assort independently on the metaphase plate
c. The alleles segregate during meiosis, and each parent can give either allele in a gamete
d. A and C are both correct
Questions 25-28 all relate to the following pedigree:
25. What type of inheritance pattern does this indicate?
a. Autosomal Dominant
b. Autosomal Recessive
c. X-Linked Dominant
d. X-Linked Recessive
26. What is the genotype of individual 1?
a. Homozygous recessive
b. Homozygous dominant
c. Heterozygous
d. Dominant (Homo or hetero is unknown)
27. What is the genotype of individual 2?
a. Homozygous recessive
b. Homozygous dominant
c. Heterozygous
d. Dominant (Homo or hetero is unknown)
28. If an unaffected male (3) and an unaffected female (4) have had one affected son
already, what is the percent chance they will have another affected child?
a. 0%
b. 25%
c. 50%
d. 100%
29. During which phase does the chromatin thicken and coil, creating the structures
we recognize as chromosomes?
a. Metaphase
b. Telophase
c. Interphase
d. Prophase
30. What would likely be the outcome of an offspring with the sex chromosome
complement of Y and O (no second chromosome)?
a. Normal Offspring
b. Turner’s Syndrome
c. Supermale Syndrome
d. Death
PART II: CELL DIVISION DIAGRAMS
**ANSWER SHEET ON THE BACK**
For the following diagrams, identify
i)
What phase of division the cell is currently is AND IF POSSIBLE
ii)
What kind of cell division is being seen (Note: for some diagrams you will not
be able to answer. Don’t Panic!)
* 2 MARKS EACH*
31.
33.
34.
32.
35.
PART III: SHORT ANSWER GENETICS PROBLEMS
**ANSWER LINED PAPER PROVIDED**
36. Suppose that feather colour in Vultures is controlled by two alleles. Black (B) shows
incomplete dominance over Brown (b) so that heterozygotes are dirty lookin’. Show a
cross of two heterozygote birds using a Punnet square, and give the genotypic and
phenotypic ratio, and a statement. (4 Marks)
37. Haemophilia is a sex-linked trait. A woman with Haemophilia marries a man with no
family history of the disorder. What are their genotypes? Use a Punnet’s square to show
this cross, and state the percentage chance that they will have a normal child. (4 Marks)
38. In mice, brown coat colour is recessive to grey coat colour and short tail is recessive
to long tail. A mouse (P1) that is heterozygous for coat colour and has a short tail mates
with a mouse (P2) that had two pure bread parents with different sized tails but both had
brown coats.
i) What are the genotypes of the P1 and P2 mice? (2 marks)
ii) What percentage of their offspring will be grey with short tails? Prove your answer
with a Punnet Square. (3 Marks)
39. A man with homozygous type B blood who is heterozygous for tongue rolling (a
dominant trait), marries a woman who has type AB blood and is homozygous recessive
for tongue rolling.
i) What are the parents genotypes? (2 Marks)
ii) What are all the phenotypic combinations that their offspring could have? (3 Marks)
40. In humans, free earlobes are dominant over attached earlobes. Individuals who are
shaded on the pedigree diagram of the Smith family have attached ear lobes.
Individuals who are not shaded have free ear lobes. Answer the following questions
using the pedigree. (4 Marks)
a) What is Edwin’s genotype?
b) What is Sally’s phenotype?
c) What is Belinda’s genotype?
d) If Sally and Ivan have a fourth child, what is the probability that their child will have
attached earlobes?
41. Prior to the Apollo Moon Landing, NASA developed a number of animal astronauts
to test their new space vessels with, prior to sending up humans. Among them were
chimpanzees, dogs and mice. In chimpanzees, the scientists were able to develop a
completely recessive gene for withstanding extreme pressure (p) that helped the monkeys
with take off and landing. As well, they developed an incomplete dominance gene for
machine control, so that the monkeys could complete rudimentary jobs while in the
cockpit (Mm). They bred a male monkey who had the pressure trait and the machine
control skill with a female monkey who was heterozygous for the pressure gene and had
only some machine control skills.
i)What are all the possible genotypes of these children? What phenotypes would
individuals with these different genotypes display? (6 Marks)
PART IV: REFLECTION **ANSWER ON LINE PAPER PROVIDED**
The following questions are based on the articles “Frankenfoods” and “Dolly was Lucky”
included in the study handout. Please answer these questions in full sentences and as
thoroughly as possible. Please note that exact details, dates, names etc., while useful, are
not the focus of these questions. Please state your opinion and defend it, based on the
materials in the articles.
FOR ALL QUESTIONS, CHOOSE ONE OF THE POTENTIAL OPTIONS
42. In the article there is discussion of the conditions of Dolly’s birth, and how the
researchers were ‘lucky’ that things ended up as they have. Discuss the areas that could
have gone wrong and how the researchers avoided these pitfalls.(6 MARKS)
OR
There has been much discussion about cloning technology and its application to industry
and human life. As well, genetic hybrids have been shown to benefit industry by gaining
some of the traits of the genes transferred. Choose one of these technologies (or both if
you like!) and discuss the basic mechanism by which the procedure is completed.
(6 MARKS)
43. In class, as well as in the media there has been discussion about cloning technology
and how it can be used, or should not be used. Based on your understanding, should there
be a limit to how this technology is used by society, and if so, explain why you would set
that limit at a particular point. (6 MARKS)
OR
Genetic Splicing technology has unleashed a number of possibilities for industrial and
consumer products. One of these areas is in the food industry, leading to the development
of groceries that may be constructed from several different species. What are your
thoughts on this practice, and in the open market what kind of warnings (if any) should
these products carry? (6 MARKS)
OR
Huntington’s disease is a degenerative neurological disorder that leads to tremors, loss of
motor control, wasting and eventually death. The gene is autosomal dominant but doesn’t
show signs until individuals are in their 30 or later. If you had an older relative who
demonstrated the gene, would you want to be tested to find out if you were carrying it?
Why or why not? (6 MARKS)
TOTAL
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ANSWER SHEET
PART I MULITPLE CHOICE: REFER TO SCANTRON
PART II DIAGRAMS
PHASE
KIND OF CELL DIVISION
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