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Q. The peppered moth provides a well-known example of natural selection. The light-coloured form of the moth was predominant in England before the industrial revolution. In the mid-nineteenth century, a dark-coloured form appeared. The difference is formed by a dominant allele of one gene. By about 1900, around 90 percent of the moths around industrial areas were dark coloured, whereas light-coloured moths were still abundant elsewhere. In fact, birds could readily find out 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 dark-coloured moths have been disappearing. Should the two forms of moths be considered separate species?
Compute the change in energy of an atom that emits a photon of wavelength 2.21 meters. (Planck's constant is 6.626 x 10-34 joule seconds; the speed of light is 2.998 x 108 m/s)
Monarch butterfly populations are found east and west of Rocky Mountains. How can DNA fingerprinting technology be used to establish that they constitute one breeding population or two separate breeding populations.
If the mutation is in mitochrondrial DNA, will the four haploid cells probably be all Pyr-, all Pyr+, or a combination? What if the mutation is in nuclear DNA. Why is mitochondrial function critical for growing on pyruvate.
In maize, a dominant allele (A) is essential for seed color as opposed to colorless (a). Another gene has a recessive allele (w) which results in waxy starch, as opposed to normal starch (W).
What organism produces the disease and how. Why is Anthrax such a potent weapon of bioterrorism? What are its characteristics that make it so.
What percent of the population are homozygous dominant. What do you assume would be the effect on the switch of reversing orientation of one of the hix sites.
Mimulus lewisii and Mimulus cardinalis are two plants that occupy the same habitat but do not interbreed in nature. Though, they can be readily crossed in the laboratory to produce fertile offspring. Which is a likely reason that prevents interbreedi..
The brown and scarlet mutations assort independently. If fruit flies that are heterozygous for both of these mutations are intercrossed, what sorts of progeny will they create, and in what proportions? Describe how you got the answer.
Which is easier to dispose of in a flock of chickens? A recessive allele for erect combs or a dominant allele for feathered legs. How various generations would it take.
Which of the follow statements regarding cancer risk factors is false. Mutagens are generally not carcinogens.
What is the total ocean area that (trillion m2) that can be classified as open ocean, that is, ocean that is greater than 960 km from the next land.
While Mexican hairless dogs are crossed with normally haired dogs, about half the pups are hairless and half have hair. While, though, two Mexican hairless dogs are mated, about a third of the pups produced hair, about two thirds are hairless and som..
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