Select all of the following that are postzygotic isolating mechanisms. 

_____Hybrids are sterile.
_____Hybrids develop abnormally.
_____Hybrids fail to become established in nature.
_____ Hybrids cannot be formed.


__X__ Hybrids are sterile.
__X__ Hybrids develop abnormally.
__X__ Hybrids fail to become established in nature.
_____ Hybrids cannot be formed.

Biology & Microbiology

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Which of the following is NOT involved in nonspecific defenses?

A. natural killer cells B. monocytes C. neutrophils D. mast cells E. B cells

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During interphase, the chromosomes are loose and thread-like but they tightly condense in preparation for mitosis. Why?

What will be an ideal response?

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Sam was in a terrible head-on collision. When he recovered from all of the obvious, external injuries, the once affable and happy-go-lucky person had become surly and very unfriendly. Which part of his cerebrum was most likely damaged?

A) prefrontal cortex B) Broca's area C) thalamus D) postcentral gyrus

Biology & Microbiology

Which of the following is a potential risk of exotic species?

a) introduction of new diseases b) native species being outcompeted c) alteration of habitats d) all of these are potential risks

Biology & Microbiology