An earthquake decimates a ground-squirrel population, killing 98% of the squirrels. The surviving population happens to have broader stripes, on average, than the initial population
If broadness of stripes is genetically determined, what effect has the ground-squirrel population experienced during the earthquake? A) directional selection
B) disruptive selection
C) a founder event
D) a genetic bottleneck
D
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Reciprocal translocations usually do not result in gain or loss of genetic information. Why can they still have devastating effects?
a. Homologs can no longer pair properly. b. Crossing over is disrupted causing meiosis to be arrested during metaphase I. c. The positions of the genes can be altered with respect to necessary regulatory sequences. d. The translocation results in an inversion.
The organisms most similar to mitochondria are
a. progenotes. b. -proteobacteria. c. cyanobacteria. d. purple sulfur bacteria.
Multicelled, absorptive structures called __________ are on the surface of each fold of the small intestines.
Fill in the blank(s) with the appropriate word(s).
Why is a newly molted crab unusually slow and clumsy?
A) Its new exoskeleton cannot support the forces that its muscles generate. B) It temporarily lacks an exoskeleton. C) Its muscles are still forming their connections with the new exoskeleton. D) Its neurons are still forming their connections with the new muscles.