HYB: pentaploids
From: Bill Shear <BILLS@hsc.edu>
>> According to my books, versicolors are natural tetraploids. The only
>> pentaploids I've heard of were all chemically induced in labs.
I'm not sure how a pentaploid (5 sets of chromosomes) would be induced
chemically in a lab, especially in irises. The few known iris pentaploids
have resulted from unreduced triploid eggs fertilized by normal tetraploid
pollen, or vice-versa, or as unexplained accidents.
With 5 sets of chromosomes it would seem that three would have to come from
one parent and 2 from another. Or would it be possible for one set to come
from a normal diploid egg or pollen grain, and 4 from an unreduced
tetraploid gamete?
Sharon, some help here?
Bill Shear
Department of Biology
Hampden-Sydney College
Hampden-Sydney VA 23943
(804)223-6172
FAX (804)223-6374
email<bills@hsc.edu>
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