The number of allele pairs that assort independently in an organism is generally much higher than the number of chromosome pairs. This phenomenon is due to
A. independent assortment.
B. segregation.
C. crossing over.
D. sex-linkage.
E. chromosome inactivation.
C. crossing over.
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All of the following types of culture media are enriched and selective except:
A) blood agar. B) colistin-nalidixic acid agar. C) phenylethyl alcohol agar D) Thayer-Martin agar.
In an antibody molecule, the ________ region mediates binding to host cells.
Fill in the blank(s) with the appropriate word(s).
Why is a pyramid of numbers for a forest sometimes narrow at the bottom?
a. Energy decreases as it passes through each trophic level. b. Energy increases as it passes through each trophic level. c. Individual producers are small and very numerous. d. Herbivorous insects vastly outnumber large producers. e. Large producers vastly outnumber insects.
Staphylococcus aureus residing in the nasal cavity
A. Infection B. Colonization C. Infectious Disease