The peppered moth provides a well-known example of natural selection. The light-colored form of the moth was predominant in England before the Industrial Revolution. In the mid-nineteenth century, a dark-colored form appeared. The difference is produced by a dominant allele of one gene. By about 1900, approximately 90% of the moths around industrial areas were dark colored, whereas light-colored moths were still abundant elsewhere. Apparently, birds could readily find the light moths against the soot-darkened background in industrial areas and, therefore, were eating more light moths. Recently, use of cleaner fuels has greatly reduced soot in the landscape, and the dark-colored moths have been disappearing. Should the two forms of moths be considered separate species?
A) Yes, because natural selection has affected the frequency of the two different forms.
B) Yes, because they have completely different coloration.
C) Yes, because they are reproductively isolated based on habitat.
D) No.
D
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a. ddNTPs are tagged with radiolabels. b. ddNTPs have 3 extra phosphate groups. c. ddNTPs lack the free 3’ OH group on the five-carbon sugar. d. ddNTPs are bound by hydrogen bonds instead of phosphodiester bonds.
In this illustration, some of the organisms are vertebrates while others are both vertebrates and amniotes. Which of the following pairs are in both clades?
a. lancelets and lampreys
b. lampreys and humans
c. rabbits and lizards
d. lancelets and rabbits
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Indicate whether the statement is true or false
You can ask your doctor ________
A) whether your new medication will interact with any dietary supplements you are taking B) whether your weight or blood pressure is in a healthy range C) what to do if you do not receive your test results D) All of the above are true.