In biotechnology research, DNA fragments created by restriction enzyme action are separated from one another via
A) filtering.
B) crossing over.
C) gel electrophoresis.
D) centrifugation.
E) PCR.
C
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The age that saw a great diversification of land plants, as well as the first amphibians, was the
a. Cambrian. b. Cretaceous. c. Devonian. d. Jurassic. e. Ordovician.
Mendel referred to the expressed trait in the F1 generation as _____. The unexpressed trait in the F1 generation was referred to as _____. For example, the purple flowering trait is dominant and the white flowering trait is recessive.
Fill in the blank(s) with the appropriate word(s).
Autoimmune disorders are
A) chronic conditions that develop from the immune system attacking healthy self-tissues that should normally be left alone. B) genetic conditions present from birth that continually degrade over time. C) caused by the immune system not being stimulated enough in adolescence and as a result is over reactive and can cross-react with host tissues. D) acute infections that target the immune system. E) short-term mistakes made by the immune system that are quickly recognized and self-limited.
Imagine that you conduct a phylogenetic analysis of sticklebacks and their relatives
You find that even though stickleback males are the only ones that show red coloration as a derived trait, female preference for red color is indeed found throughout the stickleback relatives. In sticklebacks, red color intensity in males is positively correlated with health, which led researchers to invoke the good genes model for the evolution of red coloration. Do your results change this conclusion in favor of sensory bias as an explanation? a. No, we can exclude sensory bias, as red coloration is still an honest indica-tor of male health. b. Yes, according to the new results the sensory bias model is the most parsi-monious explanation and good genes can be excluded. c. Not necessarily, one model does not exclude the other. d. If females have healthier offspring when they mate with red males, sensory bias can be excluded. e. A and D.