A further correction:
(Ova have only X, sperm have only Y)
True, ova have only X; but sperm may have either X or Y. The union of an ova
with an X-bearing sperm gives rise to a female (XX); the union of an ova
with a Y-bearing sperm gives rise to a male (XY).
Paul K.
In a message dated 9/2/2008 6:19:55 A.M. Central Daylight Time,
winwinsit(a)gmail.com writes:
A few corrections:
(the X chromosome being distinctly longer that an X Chromosome).
X is siignificantly longer/larger than Y, the Y being largely inert
and having far fewer genes.
(Thus it is the sperm that determines the sex of the
offspring, since ova only have a single Y chromosome and sperm cells only
have only an X or a Y chromosome).
Ova have only X, sperm have only Y.
The Y is passed generally unchanged from male to male, although the Y
seems to mutate more than X or other chromosomes, even though the
largely inert genes generally produce no overt difference of
appearance or function. These mutations occur every several
generations, and of the measured markers, occur rather infrequently.
A good description:
http://www.vancegenealogy.com/intro.php
Rees
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