Consider the Possibility That We Discover a Gene That Regulates

question 39

Multiple Choice

Consider the possibility that we discover a gene that regulates both the amount of root hairs and where root hairs grow on a root tip.Since the surface area provided by root hairs is so critical to their uptake of water and nutrients,expanding their growth area seems a great advantage.However,which of these might be a problem?

• A)Growth of root hairs in the zone of cell division would interfere with root cell proliferation.
• B)Growth of root hairs in the root cap would cause them to be shredded off since this area takes substantial abrasion.
• C)Growth of root hairs in the zone of elongation would cause them to be shredded off as they anchored in soil and the root lengthened.
• D)All of these choices pose a problem.

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