Which of the following types of selection favors the survival of individuals with the intermediate phenotype?
A. Disruptive selection
B. Stabilizing selection
C. Directional selection
B
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In a dihybrid cross AA BB × aa bb, what proportion of heterozygotes for both gene pairs is expected among the F2 offspring?
A) 1/4 B) 1/2 C) 3/4 D) All are heterozygotes. E) None are heterozygotes.
The cell theory states that __________ are made up of cells.
a. all living things b. archaea c. plants d. animals e. protozoa
Which one of the following types of T cells is a critical component of the immune system because it stimulates and enhances the activity of other components of the immune system?
A) T suppressor cell B) T memory cell C) T helper cell D) cytotoxic T cell E) natural killer cells
Each of the following provides protection from phagocytic digestion EXCEPT
A) M protein. B) capsules. C) formation of phagolysosomes. D) leukocidins. E) biofilms.