__________, products of master genes, act as longrange
signals that diffuse out from a source and form
a concentration gradient. Fill in the blank(s) with the appropriate word(s).
Answer: Morphogens
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Non-inbred mice had a consistently lower survival than inbred mice
__________ Indicate whether the statement is true or false.
For your eye to focus on this sentence:a
the ciliary muscle would need to contract for the lens to get rounder. b. the ciliary muscle would need to contract for the lens to get flatter. c. the ciliary muscle would need to relax for the lens to get rounder. d. the ciliary muscle would need to relax for the lens to get flatter. e. the ciliary muscle is not connected to the lens and therefore, not involved in vision.
Neurons rely on glial cells for
a. protection. b. metabolic support. c. insulation. d. All of the above
How many sperm participate in the formation of fraternal twins?
A) two B) four C) one D) three