The diagram shows genetic variation being generated via chromatid crossover. Where can crossover occur?



a. at the synaptonemal complex

b. at kinetochores

c. at recombination nodules

d. between sister chromatids


c. at recombination nodules

Biology & Microbiology

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Refer to the figure above. Which curve best describes survivorship in elephants?

A) A B) B C) C D) D E) E

Biology & Microbiology

Two populations that inhabit the same area but remain genetically distinct can best be called 

A. species. B. subspecies (races). C. polymorphic. D. allopatric species. E. sympatric species.

Biology & Microbiology

All of the following structures are tonsils except:

What will be an ideal response?

Biology & Microbiology

Ciliated gills in clams, sharks continuously swimming with their mouths partly open, countercurrent flow of blood and water in fish gills, and the use of air sacs to effect unidirectional flow of air through bird lungs are all adaptations that optimize what factor in the formula for Fick's law of diffusion?

A. A B. d C. ?p D. D

Biology & Microbiology