Part 1 a) The zygote that is formed after fertilisation divides rapidly during the first 2 weeks of pregnancy, developing into an embryo by day 12. With reference to specific structures formed, outline this period of development. b) Summarise the key developmental changes that occur from the point that the embryo is formed up to the end of the 1st trimester of pregnancy when the embryo is considered a foetus. c) What is the approximate size of the foetus by the end of this trimester?

Part 1 a) The zygote that is formed after fertilisation divides rapidly during the first 2 weeks of pregnancy, developing into an embryo by day 12. With reference to specific structures formed, outline this period of development. b) Summarise the key developmental changes that occur from the point that the embryo is formed up to the end of the 1st trimester of pregnancy when the embryo is considered a foetus. c) What is the approximate size of the foetus by the end of this trimester?

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter43: Animal Reproduction And Development

Section: Chapter Questions

Problem 43CTQ: Explain how the different germ layers give rise to different tissue types.

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