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Title Exploring human heredity
Subject Heredity, Human; Medical genetics; Adaptation (Biology)
Description Twentieth Annual Frederick William Reynolds Lecture.
Creator Stephens, Fayette Ellsworth, 1890-
Publisher Extension Division, University of Utah
Date 1956-01-16
Date Digital 2008-05-29
Type Text
Format image/jpeg
Digitization Specifications Original scanned on Epson Expression 10000XL flatbed scanner and saved as 400 ppi uncompressed tiff. Display images generated in PhotoshopCS and uploaded into CONTENTdm Aquisition Station.
Resource Identifier http://content.lib.utah.edu/u?/reynolds,362
Source LD5526 .U8 n.s. v.47 no.11
Language eng
Relation Digital reproduction of "Exploring human heredity" J. Willard Marriott Library Special Collections
Rights Digital Image Copyright University of Utah
Metadata Cataloger Seungkeol Choe; Ken Rockwell
ARK ark:/87278/s64q7rxv
Setname uu_fwrl
Date Created 2008-07-29
Date Modified 2008-07-31
ID 319670
Reference URL https://collections.lib.utah.edu/ark:/87278/s64q7rxv

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Title Page8
Description TWENTIETH ANNUAL REYNOLDS LECTURE the contents of these cells and have searched for the mechanism within them which carries so many secrets fundamental to life itself ? Let us examine briefly what they have found. With the exception of the reproductive cells, all cells of the human body contain twenty-four pairs, or forty-eight chromosomes, one of each pair originating in each parent. When a reproductive cell is produced, one of each pair of chromosomes is eliminated in a unique process of cell division, leaving only twenty-four chromosomes and their particular members of each pair of genes. At fertilization a corresponding set of chromosomes and genes is supplied by the other parent. As a result, each gene or group of genes has a counterpart in the corresponding chromosome which originated in the other parent. Thus, this separation and recombination by chance make possible new combinations of genes, which in turn lead to the countless variations found in the human race. To make the situation more complex, occasionally a "chemical accident" occurs, as a result of which a gene may change or mutate to furnish still further variation in the supply of genes for the new combination. It is the gene, not the characteristic, which is inherited. The final expression of the gene depends not only upon the other genes present, but upon the internal and external environment of the organism as well. Heredity and environment do not always play equally important roles in the production of human characteristics. Sometimes the trait in question is of such a nature that the presence or absence of a particular gene is the decisive factor, while in other cases the environment plays the decisive role. Sometimes the essential difference between a person who shows a given trait and another who does not, is a single gene. In other instances there are many genes involved. The presence or absence of one particular gene may be all that is needed to make an imbecile out of a person who otherwise might have been a genius. A genius, however, may require the concentration of many genes. Fifteen jewels may be necessary for the smooth operation of a certain watch. Yet one broken jewel may be all that is necessary to destroy the efficiency of the watch. In human populations there are numerous genes, good and bad, and each individual, with the possible exception of identical twins, has a different combination of these hereditary determiners. At the beginning of each generation these are mixed, shuffled, and one of
Format image/jpeg
Identifier 008-RNLT-StephensF_Page8.jpg
Source Original Manuscript:Exploring human heredity by Fayette E. Stephens.
Setname uu_fwrl
Date Created 2008-07-29
Date Modified 2008-07-29
ID 319642
Reference URL https://collections.lib.utah.edu/ark:/87278/s64q7rxv/319642