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Lecture 1

BIOL 1202 Lecture Notes - Lecture 1: Reproductive Isolation, Meiosis, Genotype Frequency


Department
Biological Sciences
Course Code
BIOL 1202
Professor
Pomarico
Lecture
1

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QUIZ 1 AND 2
Quiz 1
1. Catastrophism, meaning the regular occurrence of geological or meteorological
disturbances (catastrophes), was Cuvier's attempt to explain the existence of
a. The fossil record
2. About 13 different species of finches inhabit the Galápagos Islands today, all descendants
of a common ancestor from the South American mainland that arrived a few million
years ago. Genetically, there are four distinct lineages, but the 13 species are currently
classified among three genera. The first lineage to diverge from the ancestral lineage was
the warbler finch (genus Certhidea). Next to diverge was the vegetarian finch
(genus Camarhynchus), followed by five tree finch species (also in
genus Camarhynchus) and six ground finch species (genus Geospiza). Molecular
analysis in 1999 shows, the vegetarian finch is genetically no more similar to the tree
finches than it is to the ground finches, despite the fact that it is placed in the same genus
as the tree finches. Based on this finding, it is reasonable to conclude that the vegetarian
finch
a. Is no more closely related to the tree finches than it is to the ground finches,
despite its classification
3. In evolutionary terms, an organisms fitness is measured by ____.
a. Contribution to the gene poll of the next generation
4. The original source of all genetic variation is
a. Mutation
5. Phenylketonuria (PKU) is an autosomal recessive genetic disorder. The frequency of
homozygotes with this disorder is 0.0001. What is the allele frequency for the dominant
allele?
a. 0.99 (1-.0001)
6. Phenylketonuria (PKU) is an autosomal recessive genetic disorder. The frequency of
homozygotes with this disorder is 0.0001. What percentage of the population is
heterozygous?
a. 0.02 (2x1x1/100), 1-0.02= 1.98
7. A high proportion of the cats on Key West have extra toes (polydactyly). What is the
most likely explanation?
a. Founder effect
8. Suppose there is a species of bird in which females prefer to mate with brightly colored
males. However, males with bright dorsal surfaces (i.e., backs) are easier for hawks to
spot and therefore make them more often preyed upon. Which of the following is the
most likely evolutionary result
a. Males will be selected to have bright chests and dull backs
9. Which of the following pairs is least likely to represent homologous structures?
a. The legs of a bird and the legs on an insect
10. If a population has the following genotype frequencies (AA=0.42; Aa=0.46; aa=0.12),
what are the allele frequencies?
a. P= 0.65, q= 0.35
Quiz 2
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