28 Oct 2021
Problem 29
Page 1260
Section 43.2: Review Questions
Chapter 43: Animal Reproduction and Development
Textbook ExpertVerified Tutor
28 Oct 2021
Background and context
This question belongs to Fertilization and Early Embryonic Development.
The early stages of embryonic development begin with fertilization. The process of fertilization is tightly controlled to ensure that only one sperm fuses with one egg. After fertilization, the zygote undergoes cleavage to form the blastula. The blastula, which in some species is a hollow ball of cells, undergoes a process called gastrulation, in which the three germ layers form. The ectoderm gives rise to the nervous system and the epidermal skin cells, the mesoderm gives rise to the muscle cells and connective tissue in the body, and the endoderm gives rise to columnar cells and internal organs.
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