A century of mathematics in America. by Peter Duren

By Peter Duren

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30, they are reproductively isolated. " In some cases the "something" may be a special case. For example, coinciding with the above drought there might have been a geological disturbance such that a canyon came permanently to separate the protohorse and protogiraffe populations (so that they were as if on separate islands). Over the generations operation of variation, inheritance, and phenotypic selection (processes (i) to (iii)) might further adapt members of these species in 21 Variation, Heredity, Phenotypic and Reproductive Selection the direction of horse and giraffe, respectively.

Forsdyke i994c): When interviewed by Thomas Bass, Oxford zoologist Richard Dawkins tells how one reader of his book The Selfish Gene felt that the whole of his life had become empty and the universe no longer had a point (The Lives and Times of the Selfish Gene, Oct. 18). Neither in the interview nor in his book does Dr. Dawkins clarify where his science ends and religion begins. Adopting the style of Dr. Dawkins, one can answer this by saying that it depends on whether you think "God" is in a hurry.

If a male hybrid is crossed with a female hybrid (D), gametes of type T and t are produced in equal quantities by both parents, and of four offspring, three appear tall (TT, Tt, tT) and one appears small (tt). If T had not been dominant, some interaction between the T and t genomes might have produced a new phenotypic character, such as intermediate height. , two would have still had the original homozygous parental characters, TT and tt). Thus "constant hybrids" would not have been produced. Note that Tt and tT ("reciprocal crosses") are equal hybrids; the order simply relates to the convention of placing the genome of paternal origin first, so that these might be designated as TptM, and tpTM.

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