Answered: Which statements are true? Explain why…

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter49: Animal Reproduction

Section: Chapter Questions

Problem 8TYK

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Which statements are true? Explain why or why not.
1 In the early cleavage stages, when the embryo
cannot yet feed, the developmental program is driven and
controlled entirely by the material deposited in the egg by
the mother.
2 Because of the many later developmental trans-
formations that produce the elaborately structured organs,
the body plan set up during gastrulation bears little resem-
blance to the body plan in the adult.
3 As development progresses, individual cells
become more and more restricted in the range of cell types
they can give rise to.
4 At different stages of embryonic development,
the same signals are used over and over again by different
cells, but with different biological outcomes.
5 Changes in the coding regions of genes involved in
development are primarily responsible for the differences
between species.

6 The cell cycle is the ticking clock that sets the
tempo of developmental processes, with maturational
changes in gene expression being dependent on cell-cycle
progression.

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