Crossing over
a. increases variability in gametes.
b. happens only once per homologue pair.
c. occurs between sister chromatids.
d. prevents genetic recombination.
e. is followed immediately by separation of
each of the chromatids.
A
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All skeletal muscle fibers are _____
A) smooth and under involuntary control B) smooth and operate independently of other skeletal muscle fibers C) striated and under voluntary control D) smooth and under voluntary control E) striated and electrically coupled to neighboring fibers
A female salmon laying unfertilized eggs in a nest is preparing them for ____ by a male salmon.
A. external fertilization B. internal fertilization C. indirect development D. direct development E. differentiation
Secondary production in an ecosystem is always less than primary production
Indicate whether the statement is true or false
isotope
What will be an ideal response?