The Graph Below Shows the Rate of Cell Division in a Developing

question 48

Multiple Choice

The graph below shows the rate of cell division in a developing frog embryo.

Why does the rate of growth decrease dramatically after the point indicated by the arrow?

• A) At this point,development switches from rapid cell growth to cell differentiation and migration.
• B) The arrow indicates when the embryo begins to run out of its internal food source and must find another source to continue developing.
• C) This is when fertilization occurs.Before this point,the single-celled egg was growing quickly as it stored food.After this point,growth slows for the more deliberate process of development.
• D) At the time indicated by the arrow,the trophoblast separates from the inner cell mass and the two tissues begin to divide at different and slower rates.

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Definitions:

Irreversible

Describing a process or action that cannot be undone or returned to its original state.

Content Dimensions

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