Critical Thinking Activities - Chapter 39

Question 1. A human zygote at the 64-cell stage has 61 cells devoted to becoming the placenta to support the developing embryo that develops from the other three cells. In what way is this similar and different compared to the plant embryo and endosperm?

Question 2. Descriptions of the various techniques for inserting genes into plant cells indicate that the cell wall is a fairly formidable barrier. What are the practical consequences for introducing new genes, such as herbicide resistance into crop plants, if this barrier was not present.

Answers are available to instructors in the Instructor's Manual.
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