The energy that fuels most life on earth comes from ____
a. the sun
b. heat
c. sucrose
d. water
e. glucose
ANSWER: a
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In the garden pea, Mendel found that tall (D) green pods (G) and inflated pods (C) were dominant to
their alleles, dwarf (d) yellow pods (g), and constricted pods (c). Given the following genotypes, determine the chances of producing the offspring shown. (a) DD Gg Cc ? Dd Gg cc ? DD gg Cc (b) DD Gg Cc ? Dd Gg Cc ? tall green pod, constricted pod (c) Dd Gg Cc ? Dd GG cc ? tall green pod, inflated pod (d) Dd Gg Cc ? Dd Gg Cc ? D_ G_ cc (e) Dd Gg Cc ? Dd gg CC ? D_ G_ C_ (f) Dd gg cc ? DD Gg cc ? tall green pod, inflated pod (g) Dd Gg Cc ? Dd Gg Cc ? Dd Gg Cc (h) Dd Gg Cc ? Dd Gg Cc ? dd gg cc What will be an ideal response?
Which of the following correctly describes the order of events that occur when you touch a very hot
surface? 1) action potential 2) stimulus 3) receptor potential 4) transduction into electrical energy a. 1 ? 3 ? 4 ? 2 b. 2 ? 1 ? 4 ? 3 c. 2 ? 4 ? 3 ? 1 d. 4 ? 1 ? 3 ? 2 e. 3 ? 1 ? 4 ? 2
Which of these provides the selection pressure maintaining sexual reproduction, according to the Red Queen hypothesis?
A. Sexual populations have only half the fitness of asexual populations. B. Females are able to choose males with superior genes. C. Pathogens of the sexual organism evolve to overcome the organism's defenses. D. Strains with different beneficial mutations are able to come together during recombination. E. Stabilizing selection maintains a 50:50 sex ratio.
If A is dominant to a and B is dominant to b, what is the expected phenotypic ratio of the cross AaBb × AaBb?
A) 16:0:0:0 B) 8:4:2:2 C) 1:1:1:1 D) 9:3:3:1