Cystic fibrosis is caused by mutations in the CF gene, and there are several different mutations that are known to result in CF disease. The CF mutations behave as recessive alleles to the WT CF allele
If two carriers that have different mutations in their CF genes have children what is the probability that one of their children will have CF disease?
A. 100%
B. 25%
C. 50%
D. 75%
B
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Oxygen (O2) makes up about 21% of the Earth's atmosphere. The graph below depicts changes in atmospheric O2 levels measured between the years 1990 and 2008. The burning of fossil fuels produces CO2, removing O2 from the atmosphere
It has been estimated that approximately three molecules of O2 are consumed by every single molecule of CO2 produced by fossil fuel combustion. Over about 20 years, a total loss of 0.0317% O2 from the atmosphere was calculated from this data. If you compare this graph to that shown in Figure 25.1, how is the trend in O2 levels related to the trend in CO2 levels? A. Both O2 levels and CO2 levels increase over time. B. Both O2 levels and CO2 levels decrease over time. C. O2 levels decrease as CO2 levels increase. D. O2 levels increase as CO2 levels decrease.
Gene flow means most nearly the same as
a) genetic drift b) natural selection c) migration d) founder effect e) meiotic drive
An iceberg near the Arctic Circle represents which unusual property of water?
A) Its high specific heat B) Its higher density as a liquid than as a solid C) Its heat of vaporization D) Its effectiveness as a solvent
A student is observing microorganisms in a sample of pond water. One organism of interest has an obvious nucleus, small oval structures containing a green pigment, and does not appear to be motile. In which of the following groups would this microbe most likely be classified?
A. Eukaryotes (Protozoa) B. Eukaryotes (Fungi) C. Archaea D. Eukaryotes (Algae) E. Bacteria