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Problem Set Three
Please answer these questions on a
separate sheet(s) of paper, and please type. It is imperative that no part of
your answer be copied directly from an online source, or from another student, either
in this class or from a previous year. This problem set is due by safe assign,
the due date being listed on the syllabus, and is very firm.
1. A researcher is exploring a
tropical rainforest that is destined to be clear cut and turned into a palm oil
plantation, six months in the future. She encounters many species that are new
a) Which species concept would be
most expedient and effective, in the process of collecting, naming, and
describing what she finds?
b) Go online and research. Give at
least three examples of actual species that are new to science, that were
discovered in tropical rainforests, within the last few years. Why don’t
northern temperate forests yield as many new species, nowadays?
c) Why is palm oil a subject of
concern for conservationists? In a few complete sentences, explain.
2. A researcher is studying the
mating calls of a widespread species of cricket. He discovers that male
crickets collected from different locations give different calls. Furthermore,
females collected from different locations exhibit different responses to the
calls, preferring the calls of males from the location they were collected
from. The crickets are otherwise identical. In lab experiments, he demonstrates
that females will not mate with males that have a call not typical of the
location they were collected from, but if tricked, by playing calls of the
appropriate male while another type of male is present, they will in fact mate,
and these matings produce fertile offspring.
- Are these crickets a single species, or a species
complex? Is there an isolation mechanism? Explain?
- Go online and research. Give at least two examples of
species complexes composed of morphologically similar microspecies or
3. A population of humans, isolated
for centuries on an island in the Indian Ocean, exhibits the following
phenotypes for pigmentation.
This form of albinism is caused by
being homozygous recessive at a single locus.
- Assuming the population is in Hardy-Weinberg
equilibrium, calculate the expected frequency of normal and albino
alleles. How many individuals would you expect to be heterozygous?
- Go online and research. List three historically
isolated populations of humans with unusually high frequencies of a phenotype
which is uncommon elsewhere. Explain why this might be the case, for each
4.Green swordtails are
sexually dimorphic: males have a long, swordlike projection from their tails,
and females have rounded tails.
An experimenter decides to perform a
female choice experiment. He isolates unmated females with a choice of two
mails, each from one of four groups of males.
1) Unmodified control males
2) A second group of males with
tails cut off, and re-glued.
3) Males with shortened tails.
4) Males with lengthened tails.
- Imagine the researcher got the following data.
- Why might this be the case?
- Go online and research. List three studies of sexual
selection, the organism, and their conclusions.
Chosen by female # vs group, for
each trial. Trials were replicated 20 times
Trial Who the Female Chose
Group 1 vs. Group 2 Group 1- 10
Group 2- 10
Group 1 vs. Group 3 Group 1- 18
Group 3- 2
Group 1 vs. Group 4 Group 1- 6 Group
Group 2 vs. Group 3 Group 2- 16
Group 3- 4
Group 2 vs. Group 4 Group 2- 6 Group
Group 3 vs. Group 4 Group 3- 0 Group
What might this data indicate, in
terms of sexual selection?
5. Go to the following link and read
Write a two paragraph summary of
what you learned from reading it.