In this lesson our instructor talks about natural selection. First she gives a background on work of other scientists on natural selection. Then she discusses Darwin's theory of Natural Selection. She moves on to talks about genetic variation, natural selection an the peppered moth, and types of natural selection. Then, she talks about sexual selection, evidence for evolution, and homologous and analogous structure. Four complete example videos round up this lesson.
While studying species during
his voyage on the HMS Beagle, Darwin observed that:
Individuals within a population
vary in the traits that they possess.
Species produce more offspring
than can be supported by the environment and the offspring must
compete for survival.
Offspring inherit traits from
Darwin concluded that the
offspring who possess favorable traits will have a higher
probability of surviving and producing more offspring. Over many
generations, these favorable traits will increase in the population.
Stabilizing selection selects
for intermediate phenotypes and decreases the frequency of extreme
Directional selection results
in an increase in the frequency of a phenotype at one extreme of a
Disruptive selection results in
an increase in the frequency of phenotypes at both extremes.
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
The book and CD package include three full length practice exams that are presented with all questions answered and explained. The author also presents detailed reviews of all test topics and includes multiple-choice and free-response questions with answers at the end of each topic's chapter.
This book has a great topic-by topic breakdown of the 14 must-know principles with sample questions and answers for each of the subjects. Laboratory Review includes a focused review of all 12 AP laboratory exercises. Included in this is 2 full length practice tests that stimulate the actual test along with answers and complete explanations.
This book includes a comprehensive biology test topic review, covering everything from photosynthesis to genetics to evolution. Cracking the AP Biology also includes testing strategies for the grid-in and essay section, great guidance on writing a high-scoring essay, and two full length practice exams with detailed explanations.