Ecologists have documented the extinction over the last 20 years of ________ of the 110 species of harlequin frogs (Atelopus) native to tropical America.
A. 67%
B. 100%
C. 15%
D. None of the choices are correct.
Answer: A
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The part of a chromosome that shortens with each cell division, functioning as a "clock," is the
A) centromere. B) centrosome. C) centriole. D) telomere.
Cell differentiation occurs due to ____
a. unequal cytoplasmic divisions b. the removal of different genes in different cell types c. polarization of the cell d. the presence of the X and/or Y chromosome in the cell e. changes in gene expression in different cell types
Uniparental disomy can arise through nondisjunction in _____
1.meiosis 2.the early embryo 3.the zygote 4.all of the choices
According to the above table, the foraging
characteristic that would benefit an animal most in a stable ecology would be? a. A baby garter snake captures and eats a slug. b. A sitter because it would have more trouble adapting to a changing environment. c. A forager because it has the ability to adapt quickly. d. Both the sitter and the forager are equally adept in a stable ecosystem. e. All of these would benefit an animal the most.