Natural Selection, Genetic Variation & Allele Frequencies
Selection on Populations
Speciation
Natural Selection, Genetic Drift, & Gene Flow
Adaptations & Behavior
Evolution
100
Think back to the images of Darwin's Galapogos tortoises. Variations, which Darwin discovered could exit among populations in the same location, can be caused by which THREE factors?
A. Mutations B. Independent Assortment C. Overhunting
D. Crossing Over E. Artificial Selection
A, B, C
100
Normal distribution shows data in which most of the values fall in the middle of two extremes and is represented by a ______ curve.
bell
100
Which of the following examples is an example of allopatric speciation?
A. Fish in a lake begin to adopt different feeding styles at different depths.
B. A population of squirrels is separated by the Grand Canyon.
B
100
________ _______ often describes the change in allele frequences due to chance.
genetic drift
100
In the pesticide example, some insects had a mutation that made them ________.
resistant
100
Which description best fits the definition of evolution? 
The biological changes in populations over time.
200
A gene pool consists of allele pairs for freckles or no freckles (F=freckles, f=no freckles). What is the frequeny of the allele for coding for freckles in the following:
ff Ff ff ff FF Ff FF ff ff ff ff ff
6/24 or 1/4 = 25%
200
The selection trend graph that represents both extremes being favored over the average in a population is the:
disruptive
200
Which of the following examples is an example of sympatric speciation?
A. Two varieties of fruit flies in the same orchard prefer to lay eggs on different types of fruit.
B. A mountain range forms, dividing a population of beetles.
A
200
Over-hunting a species in short time period can be considered an example of what kind of effect?
Bottlenect Effect
200
This type of anatomical proof of evolution might suggest that two organisms have features that are structurally similar but differ in function.
homologous
300
Sometimes humans determine which traits are favorable and then breed organisms that show those traits, which is an example of:
A. natural selection B. adaptation C. artificial selection D. selective mutations
C
300
The selection trend graph that represents one extreme being favored over the average in a population is the:
directional
300
________ __________ results when animals of once the same species adapt different traits to survive a different environment are no longer recognized by an original group so reproduction between the two seizes to occur.
reproductive isolation
300
Flowers can grow in the wild or be cultivated. A bee may transport pollen from a farm that cultivates flowers of different colors to a nearby area where only wild white flowers grow. The pollen can fertilize the wild flower, introducing new genetic material into the wild population.This is an example of _______ _______
genetic flow
300
Wisdom teeth, the appendix, and coccyx (tailbone) are human examples of these structures ________.
vestigial
400
In artificial selection, "humans" act as the selective agent, whereas in natural selection, _______ acts as the selective agent.
nature
400
Which selection trend best describes when medium tail length in a gecko population is favored over extremely long and extremely short tail lengths?
stabilizing
400
A canyon forms as tectonic plates shift separating a group of salamanders. This is an example of ________ speciation.
allopatric
400
Genetic drift tends to affect __________ populations more.
small
500
A farmer selecting for the largest and sweetest corn is an example of...
_______ selection
artificial
500
Homologous, analogous, and vestigial structures are all:
A. molecular forms of evidence of evolution
B. anatomical forms of evidence of evoltution
C. Biochemical forms of evidence of evoltution
D. Fossils
B
600
can acquired somatic traits deveopled during a person's lifetime be passed on to offspring?
No, never
700
A gene pool is all the __________ in a population.
alleles