Leader: Kirsten Karkow
Course: Biol 211 - Wilsey
Date: 3/25/2012
Worksheet 21
Supplemental Instruction
Iowa State University
Define the following terms.
Homologous Structures –
Analogous Structures –
Vestigial Structures –
Provide an explanation of how the following support the Theory of Evolution:
1.
2.
3.
4.
5.
6.
7.
Biogeography –
Human Selection –
Fossils –
Comparative Anatomy –
Comparative Embryology –
Molecular Biology –
Convergent Evolution –
Fill in the blank.
Evolution occurs at the ____________ level. Individuals don’t undergo evolution, they undergo
_____________, which the environment can select for, leading to evolution of the species.
The process by which the environment favors certain characteristics and therefore selects for
certain alleles is known as ________________. Those organisms that better fit the environment
will exhibit greater ___________ and _______________, resulting in more offspring with those
“favorable” adaptations. This leads to changes in ____________________ (microevolution).
If enough isolation, mutation, and selection occurs in any given gene pool, a new species can be
formed. This is called ___________________.
Define the following terms.
Gene Pool –
Allele Frequency –
Genotypic Frequency –
Supplemental Instruction
1060 Hixson-Lied Student Success Center  294-6624  www.si.iastate.edu
Hardy-Weinberg Equilibrium –
Null Hypothesis –
Sample Frequency Questions:
The R allele codes for red flowers, while r codes for white flowers. Given that the allelic
frequency of R is .6, find the frequency of r and the genotypic frequencies of RR, Rr, and rr.
Assume the population is in Hardy-Weinburg equilibrium.
If 98 out of 200 individuals in a population express the recessive phenotype, what percent of
the population would you predict to be heterozygous?
Assuming that the actual frequency of the heterozygote genotype in the above problem is 16%,
what can be concluded?