A person with two mutated alleles for the MC1R gene makes more reddish than brownish melanin, resulting in red hair. DNA from two Neanderthal fossils contains a mutated MC1R allele that has not yet been found in humans. These data best support the conclusion that:
1.Neanderthals had red hair.
2.Neanderthals did not have brown hair.
3.Neanderthals had a variety of hair colors.
4.Neanderthal MC1R allele was less active than unmutated MC1R.
4
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Lamarck's theory of evolution proposed all of the following EXCEPT
a. Species change through time. 414 b. New characteristics are passed from one generation to the next. c. Organisms change in response to their environment. d. Changes that an animal acquires during its lifetime are inherited by its offspring. e. Changes in species are a result of evolutionary mechanisms
What prevents host cells from being lysed by the complement system?
a. Host cells are continually replaced. b. Host cells hydrolyze complement proteins. c. Host cells express endogenous proteins. d. Complement proteins only bind to cellulose.
Which of the following is not part of the upper respiratory tract?
A. Trachea B. Mouth C. Pharynx D. Nasal cavity E. Larynx
Evolution acts at the level of the
A. ecosystem. B. population. C. species. D. community.