Explain why a certain mutation in a genome may not continue to be beneficial after an environmental stressor is removed
What will be an ideal response?
Expression of certain genes always contains certain costs and benefits. In some cases, expression of a mutated gene may be very costly in some aspects. However, if this mutation allows for survival and reproduction, the benefit outweighs the cost. On the other hand if the environmental stressor is removed, the cost may exceed the benefit. Those individuals with the mutation now lose the advantage because they are "spending" resources on a useless protein rather than one of current benefit.
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How many extrinsic eye muscles are responsible for moving each eye?
a) 10 b) 12 c) 6 d) 4 e) 20
Match the stage of interphase with the event(s) that occur(s): G2
A)The cell permanently stops dividing. B)DNA replicates. C)The cell is metabolically active, synthesizing proteins, and growing rapidly. D)Cell division enzymes are synthesized, and the centrioles complete replication.
This vein of the upper limb is often the site from which blood is drawn
A) basilic B) median cubital C) median antebrachial D) cephalic
The aponeurosis of the external oblique forms the ________ at its inferior margin.
A. rectus sheath B. inguinal ligament C. medial retinaculum D. linea alba E. linea semilunaris