Chap 25 and 54:
Macroevolution and Ecology/Biomes
Supplemental Instruction
Iowa State University
Leader:
Adam
Course:
Biology 211
Instructor:
Dr. Wilsey
Date:
Chapter 25
___________This concept views a species as a population or group of population whose
members successfully interbreed. Biological species
-What are some limitations to this concept?
________ This view a species as defined by anatomical features
________ This views a species in terms of its unique ecological niche
a. Biological species concept
b. Ecological species concept
c. Morphological species concept
Mechanism of Speciation
1. Allopatric speciation:
a. Occurs when some members of a species occupy a habitat that is
_____________ from other members.
Examples that cause allopatric speciation:
2. Sympatric speciation:
a. Occurs in populations that live in the _______ geographic area.
Patterns of Speciation:
1. _________________: Budding of one or more new species from a parent species that
continues to exist.
2. __________________: Transformation of an unbranched lineage to a new species different
from ancestral population
???? which mechanism of speciation would be the most common cause of cladogenesis????
Question: The first step in allopatric speciation is ______.
a. Mutation
b. Genetic Drift
c. Geographic isolation
Supplemental Instruction
1060 Hixson-Lied Student Success Center  294-6624  www.si.iastate.edu
How do species arise:
Place the following terms in the correct area: Anagenesis, Cladogenesis, linear speciation,
divergent speciation
Mechanisms of Macroevolution
_________- structure that evolved in one context, co-opted for another
-Does this occur because of anticipation of future use?
_____________________________________- Field of biology that compared the development
of different organisms in attempt to understand ancestral relationships between organisms and
the developmental mechanism that brings about evolutionary change
-involves the discovery of genes that control what?
-example would be…
___________ growth- gene controls the rate of development for different parts
Ex: compare growth of head between species
Chapter 54
1. Ecology is the study of interaction among and between ________ and their
___________.
2. What type of interaction is among living things?
3. What type of interaction is between organism and nonliving components of environment?
4.
Scale of Ecology:
Place the following in the correct order
community, population, organismal, and ecosystem
1. What influences climate along the coasts of continents?
2. What characteristic of earth allows seasons?
3. The prevailing weather conditions in an area are known as __________?