The Ascent of Science by Silver Brian L.;

The Ascent of Science by Silver Brian L.;

Author:Silver, Brian L.; [Silver Brian L.]
Language: eng
Format: epub
ISBN: 9780195134278
Publisher: Oxford University Press USA - OSO
Published: 2015-03-23T07:01:09+00:00


Figure 21.3 Sex-linked inheritance. The recessive (black) gene in question does not appear on the short male Y chromosome but is carried by the female on one of her X chromosomes.

Figure 21.4 The production of male gametes, called sperm in the case of man. The organism in this illustrative case has only one pair of chromosomes.

There are a variety of abnormalities associated with a small percentage of humans who carry more than one Y chromosome. The best known are XYY individuals, having forty-seven chromosomes and being popularly dubbed supermales. Such men appear to have an above-average chance of being violent.

Another complicating factor in heredity, one that occurs throughout the animal and plant kingdoms, is recombination or crossing-over. It plays a vital part in heredity.



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