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BIOLOGY 1M03 Study Guide - Final Guide: Chi-Squared Test, Lactose Intolerance, Chi-Squared Distribution


Department
Biology
Course Code
BIOLOGY 1M03
Professor
Jon Stone
Study Guide
Final

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Pre Tutorial Quiz- Data Collection and
PTC Tasting
Question 1 1 / 1 point
All of the following statements are true about individuals who can taste PTC except:
Question options:
a) They tend to avoid many bitter substances
b) They may find certain vegetables aversive
c) The may be less likely to smoke
d) They must have two copies of the "taster" allele
e) Most people are able to taste PTC
Question 2 1 / 1 point
Which of the following statements is true about the ability to taste PTC?
Question options:
a) The ability to taste PTC is associated with other observable phenotypic traits
b) PTC tasting is heritable, but it is not part of an individual's phenotype
c) Individuals only need to possess one copy of the "taster" allele to be able to detect PTC
d) Individuals who possess one copy of the "non-taster" allele cannot taste PTC
e) Both a and c are correct
question set
Question 3 0 / 1 point
You are interested in whether dimples are a dominant or recessive trait. Which of the following
statements would support the hypothesis that dimples must be dominant?
Question options:
a) When both parents have dimples, all of those parents' children must also have dimples
b) Genetic analysis reveals that an individual requires only one copy of the "dimples" allele
in order to have dimples
c) In some families, all of the males have dimples but none of the females
d) Dimples may be present in children whose parents do not have dimples
e) The siblings of an individual with dimples also has dimples
Question 4 0 / 1 point
Your research team suspects that lactose intolerance is a recessive trait. Which of the following
observations would contradict your theory?
Question options:
a) Two lactose intolerant parents always have children who are lactose intolerant
b) Genetic analysis shows that individuals must possess two copies of the "lactose
intolerance gene" to show the lactose intolerant phenotype
c) Two parents, both lactose intolerant, have a child who is not lactose intolerant
d) Two parents, one able to tolerate lactose and the other intolerant, have a child who is
able to tolerate lactose

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e) Two parents, one able to tolerate lactose and the other intolerant, have a child who is
not able to tolerate lactose
question set
Question 5 1 / 1 point
You decide to perform a chi square test to determine whether, after rolling a die multiple times, the six
possible outcomes of the rolls occur with an even distribution. You roll the die 60 times and record the
number of occurrences for the six sides: 8, 9, 10, 11, 12, 10. Using these values, you calculate the chi
square statistic to be 1.00. You have determined the critical value to be 11.070 These results indicate:
Question options:
a) The die is skewed and null hypothesis is correct
b) The die is honest and the null hypothesis is correct
c) The die is skewed and the null hypothesis is incorrect
d) The die is honest and the null hypothesis is incorrect
Question 6 1 / 1 point
You have set up an experiment where you are measuring the pollination of flowers by hummingbirds.
You suspect that flower coloration influences the birds' choice of which flower to visit. You select a study
area with equal numbers of the four types of flower coloration; flowers may be all red, red and yellow,
all yellow, or white. You decide to measure the number of humming bird visits to each colour of flower,
and use the chi square test to determine whether your hypothesis is correct.
Using the chi-square distribution chart, what would the critical value be for your chi square statistic,
(assume the desired statistical significance is 0.05)?
Question options:
a) 3.841
b) 7.815
c) 2.366
d) 5.991
e) 1.386
Question 7 0 / 1 point
Many statistical tests are used in biology. Based on the explanation of when and why we use the chi-
square test from the introduction in your student package, which of the following would be the best
example of an instance where we would use chi square?
Question options:
a) Two populations of drosophila (fruit flies) are monitored for population growth; you
wish to determine if one population has become significantly larger than the other
b) You want to measure whether one fish species consumes more food over a 24-hour
period than another species
c) A bear has four possible sites to visit in search of food; you wish to determine whether
the bear's visits to each site are evenly distributed
d) You have six experimental mice and wish to test if their average mass differs from a
control group of mice
e) You have measured male mating frequencies in a particular bird population and would
like to measure whether brightly-coloured males mate more than dull-coloured males
Question 8 1 / 1 point

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You have set up an experiment where you are measuring the pollination of flowers by hummingbirds.
You suspect that flower coloration influences the birds' choice of which flower to visit. You select a study
area with equal numbers of the three types of flower coloration; flowers may be all red, red and yellow,
or all yellow. You decide to measure the number of humming bird visits to each colour of flower, and
use the chi square test to determine whether your hypothesis is correct.
Which of the following best states your null hypothesis?
Question options:
a) the birds will show a preference for one type of flower colour, relative to the others
b) the data will not indicate whether or not the hypothesis is correct
c) the birds will visit each flower-colour type exactly the same number of times
d) the birds' flower visits will be evenly distributed among the three flower-colour types
e) birds will not visit non-preferred flowers
Question 9 1 / 1 point
You have set up an experiment where you are measuring the pollination of flowers by hummingbirds.
You suspect that flower coloration influences the birds' choice of which flower to visit. You select a study
area with equal numbers of the four types of flower coloration; flowers may be all red, mostly red with
some yellow, and mostly yellow with some red, or all yellow. You decide to measure the number of
humming bird visits to each colour of flower, and use the chi square test to determine whether your
hypothesis is correct.
What is the value for the degrees of freedom in your experiment?
Question options:
0
1
2
3
Not enough information is provided
Question 10 1 / 1 point
You decide to perform a chi square test to determine whether, after rolling a die multiple times, the six
possible outcomes of the rolls occur with an even distribution. You roll the die 60 times and record the
number of occurrences for the six sides: 5, 6, 15, 7, 13, 14. Using these values, you calculate the chi
square statistic to be 10.00. You have determined the critical value to be 11.070
Which of the following statements are supported by your results:
Question options:
a) The die is unfair because the critical value exceeds the chi square statistic
b) The die is fair because the critical value exceeds the chi square statistic
c) The die is unfair because the critical value is less than the chi square statistic
d) The die is fair because the chi square statistic exceeds the critical value
e) The die is fair because 5+6+15+7+13+14 =60
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