Tips for Writing Diploma Exams.
Directing words may be a small part of a whole question but have a very specific function. Certain expectations in your answer are required for given words. See pages 760-761 in the textbook.
In Labs or Written Response questions:
•Interpret is to give meaning to the data that adds to the original data.
What might your corn cob mean with respect to the expected results. Note that when you combine all the data collected as a class, observed probabilities are very close to expected probabilities. This is related to sample size which is a point that is made during population studies in ecology
•Evaluate is to give the worth of something (the lab) by identifying the good or bad points (say on how the lab was conducted, experimenter error, etc.).
Answer the following two questions.
(a) How does the corn cob that you analyzed compare with the expected results of a 9:3:3:1 ratio of dihybrid cross with both parents heterozygous in both traits? 2 marks
(b) Interpret your observed experimental results with the expected results of a dihybrid cross. 2 marks
___________________ ___________________ ______________
THUMBNAIL #1
The genotype of a parent generation in which a yellow heterozygous tall pea plant is pollinated with a dwarf heterozygous green plant is
Question 30 options:
A) P1 = Ttgg x ttGg
B) P1 = Ttgg x ttgg
C) P1 = Ttgg x ttGG
D) P1 = TtGg x TtGg
Hide hint for Question 30:
(a) TtGg x ttgg
(b) TtGg x TtGg (actually, any combination)
(c) ttGG x TTgg
If you start writting the tall trait first, continue this pattern all throughout the question.
___________________ ___________________ ________
THUMBNAIL #2
A pea plant that is heterozgous tall and having homozygous green pods has the genotype and phenotype, respectively, of
Question 29 options:
a) TTGG: height → dwarf; pod colour → green
B) TTGg: height → tall; pod colour → yellow
C) ttgg: height dwarf; pod colour → yellow
(This is a true description of ttgg, but does it answer the question?)
D) TtGG: height → tall; pod colour → green
Hide hint for Question 29
If the questions represent an individual parent, each genotype should have two alleles for the first trait, and two alleles for the second trait [4 letters in total].
(a) TTGG; if the symbol T for tallness is written first, then continue with T or t's first all throughout the question.
(b) TtGg; both traits exhibit the heterozygous condition
(c) ttgg; even if described as yellow dwarf, it is written ttgg as the tall trait has been indicated to be written first.
(d) TTGG; even though green is described first, TTGG
(e) Ttyy
(f) ttGg; are you getting better at forming the genotype in dihybrid inheritance?
(g) ttgg (homozygous recessive); used to test if the other parent is homozygous or heterozygous for a trait.
___________________ ___________________ _________
THUMBNAIL #3
In a case of incomplete dominance, pink flowers are produced from the mating of pure four-o'clock plants.
Numerical Response
If a first filial cross mates genotype 3 x genotype 2, then the phenotypic ratio is
Answer: ______ : ______ : ______
white pink red
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thumbnail #4
A pea plant that is heterozgous tall and having homozygous green pods has the genotype and phenotype, respectively, of
Question 29 options:
A) TTGG: height → dwarf; pod colour → green
B) TTGg: height → tall; pod colour → yellow
C) ttgg: height dwarf; pod colour → yellow
(This is a true description of ttgg, but does it answer the question?)
D) TtGG: height → tall; pod colour → green
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