Date:______
Name:______
SBI3U – GENETIC PROCESSES UNIT TEST
Knowledge/Understanding / Communication / Thinking and Inquiry / Application/13 / /8 / /12 / /4
Write your name in the top right corner of each page.
For Part B and Part C, circle your answer in the tables below.
Good lucks!
PART B: MATCHING [K/U - / 6 marks]
Question / Answer1 / A / B / C / D / E / F / G / H / I / J
2 / A / B / C / D / E / F / G / H / I / J
3 / A / B / C / D / E / F / G / H / I / J
4 / A / B / C / D / E / F / G / H / I / J
5 / A / B / C / D / E / F / G / H / I / J
6 / A / B / C / D / E / F / G / H / I / J
PART C: MULTIPLE CHOICE [K/U - / 7 marks]
Question / Answer1 / A / B / C / D / E
2 / A / B / C / D / E
3 / A / B / C / D / E
4 / A / B / C / D / E
5 / A / B / C / D / E
6 / A / B / C / D / E
7 / A / B / C / D / E
PART A: SHORT ANSWER [24 marks]
Answer the following questions in the space provided. The number of marks is indicated in each bracket. You must show all work to get full marks for each question. Make sure I will be able to distinguish your uppercase letters from your lower case letters, so choose the letters you use wisely. For example, don’t use the letter ‘S’.
1) Black coat colour in cocker spaniels is dominant to the white coat colour. Spotted coat pattern is recessive to the solid coat pattern. The gene for pattern arrangement is located on a different chromosome than the one for colour, and the pattern gene segregates independently of the colour gene. A male that is heterozygous for the coat colour trait and heterozygous for the coat pattern trait mates with a female that is white and homozygous dominant for the coat pattern trait.
[T/I - / 8 marks]
(2 marks for Punnett square(s))
a. What is the genotype of the male cocker spaniel? (1 mark) BbHh
b. What is the genotype of the female cocker spaniel? (1 mark) bbHH
c. What are all the possible phenotype(s) of their offsprings? (2 marks)
Black with a solid coat, white with a solid coat
d. One of the offsprings from this mating (between the male of 1a and female of 1b) is black with a solid pattern. What are the all possible genotype(s) of this offspring? (1 mark)
BbHH, BbHh
e. What is the probability that the offspring from this mating (between the male of 1a and female of 1b) will be white with a solid pattern? (1 mark)
1/2 or 0.50 or 50%
2) Use the pedigree below to help you answer the following questions. The affected individuals in this pedigree have an inherited genetic disorder. [A – / 4 marks]
a. How many of the individuals with the inherited genetic disorder are male in this family?
(1 mark) 4
b. How many grandchildren does the couple in the first generation have? (1 mark) 5
c. What type of inherited genetic disorder do the affected individuals in this family have?
(1 mark) Autosomal dominant
d. Is there enough information to determine the genotype of the female in the first generation? If so, what is her genotype? (1 mark) aa
3) Describe the difference between incomplete dominance and co-dominance. Provide an example of each. Use full sentences and only the space provided. [C – 4 marks]
Incomplete dominance / Co-dominance1) In humans, individuals affected with adrenoleukodystrophy experience a build-up of fatty acids that causes progressive brain damage and death. This condition is an X-linked recessive disorder. Predict the genotypic and phenotypic ratios that would result from each of the following couples: [T/I - / 4 marks; C - / 4 marks]
a. A female with adrenoleukodystrophy and a male with adrenoleukodystrophy
(1 mark, T/I) Female’s genotype: XrXr Male’s genotype: XrY
(1 mark, T/I)
(1 mark, C) Genotypic ratio – 1 : 1 (XrXr : XrY)
(1 mark, C) Phenotypic ratio – 1 : 1 (females with adrenoleukodystrophy : males with adrenoleukodystrophy)
b. A female who is a carrier for adrenoleukodystrophy and a male with adrenoleukodystrophy
(1 mark, T/I) Female’s genotype: XRXr Male’s genotype: XrY
(1 mark, T/I)
(1 mark, C) Genotypic ratio – 1 : 1 : 1 : 1 (XRXr : XrXr : XRY : XrY)
(1 mark, C) Phenotypic ratio – 1 : 1 : 1 : 1 (females without adrenoleukodystrophy : females with Duchenne adrenoleukodystrophy : males without adrenoleukodystrophy : males with adrenoleukodystrophy)
PART B: MATCHING [6 marks, K/U]
Answer all matching questions on the table provided on the first page by circling the correct letter. There is only ONE answer per question; select the best definition for each term. Each question is worth one mark.
1. Genotype (I) / A. An organism that has two different alleles for a certain gene
2. Phenotype (B) / B. The physical and physiological traits of an organism
3. Dominant (C) / C. The form of a trait that always appears when an individual has an allele for it
4. Recessive (F) / D. An organism that has two identical alleles for a certain gene
5. Homozygous (D) / E. An organism that has dominant alleles for two different genes
6. Heterozygous (A) / F. The form of a trait that only appears when an individual has two alleles for it
G. One of two or more forms of a gene
H. The form of a trait that never appears when an individual has an allele for it
I. The combination of alleles for any given trait, or the organism’s entire genetic make-up
J. An organism that has recessive alleles for two different genes
PART C: MULTIPLE CHOICE [6 marks, K/U]
DF Answer all multiple choice questions on the table provided on the first page by circling the correct letter.. There is only ONE answer per question; select the best response for each question. Each question is worth one mark.
1) A test cross is one in which the organism with the..
a. unknown genotype is mated with an organism that is heterozygous for the trait
b. unknown genotype is mated with an organism that is homozygous recessive for the trait
c. unknown genotype is mated with an organism that is homozygous dominant for the trait
d. known genotype is mated with an organism that is heterozygous for the trait
e. known genotype is mated with an organism that is of the opposite genotype to the organism being tested
2) Which of the following statements regarding phenotypic ratio is true?
a. From Mendel’s monohybrid cross experiment using peas, he observed a phenotypic ratio of 1:2:1 in the F2 generation.
b. From Mendel’s dihybrid cross experiment using peas, he observed a phenotypic ratio of 9:2:2:1 in the F2 generation
c. If the traits Mendel examined in his monohybrid cross experiment followed an incomplete dominance inheritance, he would not have observed a phenotypic ratio of 3:1 in the F2 generation
d. Both (a) and (b) is true, but not (c)
e. All statements from (a) to (c) are true
3) The probability of inheriting two traits (e.g., both dimples and freckles) is equal to the probability of..
a. inheriting the first trait plus the probability of inheriting the second trait. This is only true if the inheritance of one trait is dependent of the inheritance of the other trait.
b. inheriting the first trait plus the probability of inheriting the second trait. This is only true if the inheritance of one trait is independent of the inheritance of the other trait.
c. inheriting the first trait multiplied by the probability of inheriting the second trait. This is only true if the inheritance of one trait is dependent of the inheritance of the other trait.
d. inheriting the first trait multiplied by the probability of inheriting the second trait. This is only true if the inheritance of one trait is independent of the inheritance of the other trait.
e. None of the statements above is true.
4) The law of segregation states that traits are determined by pairs of alleles that..
a. separate from each other during meiosis so that each gamete receives one allele
b. separate from each other during mitosis so that each gamete receives one allele
c. come together during mitosis so that each gamete receives two pairs of allele
d. come together during meiosis so that each gamete receives two pairs of allele
e. None of the statements above is true
5) Which of the following statements regarding the law of independent assortment is false?
a. The law of independent assortment states that the alleles for one gene segregate or assort independently of the alleles for other genes during gamete formation
b. This law applies to genes that are linked
c. Mendel came up with this law after analyzing his dihybrid cross experimental results
d. This law was demonstrated in the beaker babies activity
e. Both (C) and (D) are false
6) Which of the following statements regarding gene therapy is false?
a. Gene therapy is a technique aimed at treating genetic disorders by introducing the correct form of the defective gene into a patient’s genome
b. In gene therapy, a copy of the normal gene is inserted into a vector which is usually the DNA of a virus
c. The benefits of gene therapy is currently short-lived because new genes are not successfully integrated into the cell’s chromosome
d. Gene therapy is no longer in the experimental stage
e. The goal of gene therapy is to cure all genetic disorders
7) The Rh gene (rhesus factor) is located on a different chromosome and segregates independently of the ABO genes. The Rh+ allele is dominant over the Rh- allele. A child with blood type O, Rh-negative, could not have..
a. a mother with blood type A, Rh-positive and father with blood type B, Rh-negative
b. a mother with blood type O, Rh-negative and father with blood type B, Rh-positive
c. a mother with blood type AB, Rh-negative and father with blood type O, Rh-negative
d. a mother with blood type O, Rh-negative and father with blood type O, Rh-negative
e. All of the couples above could be the parents of this child