In this lesson our instructor talks about development. First she discusses the cleavage, blastula formation, and gastrula formation. Then she talks about cytoplasmic determinants, the bird embryo and extraembryonic membranes. Lastly, she lectures on the mammalian embryo, organogenesis, and induction. Four complete extra example videos round up this lesson.
The first phase
of embryological development is cleavage. During this process, the
embryo undergoes a series of cell divisions but little overall
During the next
stage, a hollow ball of cells called a blastula forms. A
fluid-filled blastocoel is within the blastula.
relocate and differentiate to form a gastrula. The gastrula consists
of three germ layers: the ectoderm, mesoderm and endoderm. The
following organs and systems develop from each layer:
epidermis, hair, nails, nervous system, cornea and lens of the eye,
circulatory system, musculoskeletal system, excretory system and
most of the reproductive system.
Endoderm linings of the GI and respiratory tracts; pancreas,
liver and gall bladder; thymus; thyroid gland
is the formation of organs. During this process, the cells
differentiate. The notochord and neural tube form early in chordate
refers to the influence of one group of cells on the development of
another group of cells. This process is mediated by diffusible
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.