The analysis of parent—offspring conflict in birds has generated some interesting observations. For example, researchers hypothesized that chicks should beg to be fed by their parents more loudly when their nestmates are less closely related. (See Figure A, where Of = optimal parental investment where the lost siblings are full sibs, and Oh for an offspring whose lost siblings are half sibs.)
Do the data collected bear this out (Figure B)? Figure A Figure B
A) Yes, species that evolve extra-pair parentage also tend to evolve louder begging chicks.
B) No, the genetic relatedness of the chicks has nothing to do with the level of begging by chicks.
C) The data are inconclusive; no conclusion can be formulated.
A
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Bryophytes differ from all other land plants in
that they
a. possess swimming sperm. b. have stomata. c. have dependent sporophytes. d. exhibit alternation of generations. e. protect the embryo inside parental tissue
A free-swimming jellyfish has a body form known as a
a. polyp. b. strobila. c. medusa. d. hydra.
Even after the angiosperms became the dominant
plants on Earth, the conifers retained a competitive edge a. at high elevations in the far north. b. in temperate northeastern coastal regions. c. in mid-continent plains. d. in southern woodlands. e. in northwestern scrub forests.
Which of the following is mismatched?
A) ergot — gangrene B) Salmonella endotoxin — lyses red blood cells C) Vibrio enterotoxin — secretion of Cl-, K+, and H2O D) aflatoxin — liver cancer E) shiga toxin — tissue destruction