The immediate ancestors of the genus Homo belonged to the genus:a
Australopithecus.
b. Pongo.
c. Pan.
d. Sahelanthropus.
e. Ardipithecus
A
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In higher organisms, successful mating can occur between members of the same
A. genus. B. species. C. class. D. order.
Which of the following ions plays the most prominent known role in the opening and closing of
stomata?
a. Ca2+ b. Cl? c. K+ d. NH4 + e. Na+
What explains the viability of individuals with aneuploidies for the sex chromosomes?
a. Sex chromosomes carry less information than autosomes. b. The lack of crossing-over between the X and the Y chromosomes. c. Sex chromosomes are smaller than most autosomes.
d. The information on sex chromosomes is duplicated on the autosomes. e. Dosage compensation, by which one X chromosome per cell is inactivated
How has gene duplication played a critical role in evolution?
a) It produces redundant copies of existing genes, which are then free to mutate and adopt new functions. b) It almost always introduces immediate benefits for the organism. c) It increases the amount of DNA in the genome. d) It increases the number of pseudogenes in the genome. e) It increases the likelihood of viral infection in cells.