Inbreeding depression is caused by:
a. a reduction in fitness caused by deleterious recessives
b. random mating
c. mutation-selection balance.
d. A and B.
e. All of the above.
A
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If nondisjunction occurs during meiosis I, ____
a. two gametes will be normal and two will be missing one chromosome b. two gametes will be normal and two will have one extra chromosome c. three gametes will be normal and one will have two extra chromosomes d. all gametes will be normal e. all gametes will be abnormal
Which of the following statements is true?
a. If the numbers of a population decrease, an endangered species may be reclassified as a threatened species. b. If the numbers of a population decrease, a threatened species may be reclassified as an endangered species. c. If the numbers of a population increase, a threatened species may be reclassified as an endangered species. d. The terms threatened species and endangered species mean the same thing.
Nitrogen has an atomic number of 7. How many
hydrogen atoms are necessary to join with the nitrogen to form a stable compound? a. 1 b. 2 c. 3 d. 4 e. 5
What is the name given to the viral DNA incorporated into a lysogenic cell?
a. Prophage b. Oncogenic virus c. Latent phage d. Bacteriophage