What type of trait is the result of the expression of two or more genes?
a. pleiotropy
b. polygenic
c. codominance
d. penetrance
e. multifactorial
ANSWER: b
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Which of the following is true?
a) The aqueous layer of the tear film is the thickest layer. b) The lipid layer of the tear film is produced by the conjunctival goblet cells. c) The mucin layer is secreted by the glands of Wolfring. d) There are 4 layers of the tear film.
Mantled howler monkeys have been found to obtain most of their food from relatively rare trees, even though finding these trees takes much longer than finding common trees. Nutritional analyses of both rare and common trees found that the rare trees tended to be higher in protein and water, while the common trees tended to be higher in crude fiber and plant secondary compounds. What process would maintain this behavior in mantled howler monkey populations?
A. habituation B. imprinting C. natural selection D. sexual selection E. visual communication
a deficiency in what mineral leads to anemia
What will be an ideal response?
The mechanism of beta-lactam drugs causes the targeted microbial agents to be susceptible to_______.
A. cold B. radiation C. osmotic pressure D. heat