Which is true with regard to the Hardy-Weinberg concept? 

A. Gene frequencies change on a random basis.
B. Mutation prevents the Hardy-Weinberg equilibrium from being achieved.
C. Gene frequencies are unaffected by population size.
D. The Hardy-Weinberg concept only applies to animal populations.


B. Mutation prevents the Hardy-Weinberg equilibrium from being achieved.

Biology & Microbiology

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Match the following items with the correct phrases.

_______1. In the nitrogen cycle, bacteria called ____________________ convert atmospheric nitrogen gas into ammonia in the soil. _______2. ____________________ live in the root nodules of legumes such as alfalfa and clover. _______3. ____________________ are capable of converting the nitrogen within a dead plant or animal into ammonia in the soil. _______4. In the nitrogen cycle, soil organisms called ____________________ convert ammonia into nitrites, and nitrites into nitrates. _______5. In the nitrogen cycle, soil organisms called ____________________ convert the nitrogen in nitrates to nitrogen gas in the atmosphere. a. cyanobacteria b. denitrifying bacteria c. nitrifying bacteria d. nitrogen-fixing bacteria e. saprophytes

Biology & Microbiology

What event initiates development?  

A.  fertilization B.  cleavage C.  gastrulation D.  organogenesis

Biology & Microbiology

What was the most important adaptation of the reptiles and birds to life on land?  

A.  the shelled egg B.  the amniotic egg C.  the external egg D.  the impermeable egg

Biology & Microbiology

An animal that relies on a digestive tract for digestion breaks down food by

a) intracellular digestion only b) both intracellular and extracellular digestion c) extracellular digestion only d) neither intracellular nor extracellular digestion

Biology & Microbiology