Bacteria have a region of the cytoplasm known as the ________, which is not bounded by a membrane but contains the chromosome.
Fill in the blank(s) with the appropriate word(s).
nucleoid
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Which of the following will eventually produce a
mature male gametophyte? a. megaspore b. microsporangium c. microspore d. microgamete e. megagametophyte
A translocation involving chromosome 21 can result in
A. a risk for Down syndrome independent of maternal age. B. a risk for Down syndrome dependent on paternal age. C. no increased risk outside of maternal age. D. lowering the risk of Down syndrome. E. no change in the risk for Down syndrome.
________ are genes that exist in more than two allelic forms. The genes responsible for the human ABO blood types are an example of this phenomenon
Fill in the blank(s) with correct word
Which example below will most likely guarantee that two closely related species will remain distinct biological species?
A) colonization of new habitats B) convergent evolution C) hybridization D) geographic isolation from one another E) reproductive isolation from one another