Which of the following is NOT true?
a. Down syndrome is an example of aneuploidy.
b. The majority of cases of human sex chromosome
abnormalities may never be diagnosed.
c. Most embryos with a normal chromosome
number miscarry.
d. Aneuploidy is usually fatal in humans.
e. Aneuploidy typically arises through
nondisjunction.
Answer: c
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Which element is most likely to accept an electron from another atom?
a. chlorine (7 valence electrons) b. calcium (2 valence electrons) c. neon (8 valence electrons)
d. carbon (4 valence electrons) e. potassium (1 valence electron)
In marine crocodiles excess salts are removed by:
a. salt glands in the tongue. b. salt glands above the eyes. c. concentrated urine. d. salt glands on the skin. e. salt glands in the nose.
What process involves the gradual replacement of plant species in a rainforest over time (for example, as it progresses from an old agricultural field back to a forest)?
A) intertropical convergence B) desertification C) succession D) deforestation
Mammals descended from a group of reptiles known as:
a. eutherians. b. lancelets. c. therapsids. d. holothurians. e. labyrinthodonts