Re: HYB:double fertilization
- Subject: Re: [iris-talk]HYB:double fertilization
- From: p*
- Date: Fri, 24 May 2002 03:26:58 -0000
Cool! Thanks, Bill.
Patricia
--- In iris-talk@y..., Bill Shear <wshear@e...> wrote:
> Double fertilization refers to the process that takes place in
every seed
> plant. Each pollen grain contains 2 sperm nuclei. One of them
fertilizes
> the egg nucleus, which produces the embryo plant. The other fuses
with two
> additional nuclei in the ovule to produce the endosperm tissue,
which stores
> food in the seed (yes, the endosperm tissue is thereby triploid!).
>
> If mixed pollen is applied to a stigma, it is possible for the
seeds in the
> resulting pod to have different pollen parents. Each ovule
fertilization
> event is separate. That means there has to be at least one pollen
grain for
> each seed produced; no more than single ovule can be fertilized by
a single
> pollen grain.
>
> Bill Shear
> Department of Biology
> Hampden-Sydney College
> Hampden-Sydney VA 23943
> (434)223-6172
> FAX (434)223-6374
> email<wshear@e...>
> Moderating e-lists:
> Coleus at http://groups.yahoo.com/group/coleus
> Opiliones at http://groups.yahoo.com/group/opiliones
> Myriapod at http://groups.yahoo.com/group/myriapod
> MilliPEET website at
>
http://www.fmnh.org/research_collections/zoology/zoo_sites/millipeet/h
ome.ht
> ml
> SHAPE OF LIFE website at
> http://www.pbs.org/kcet/shapeoflife/episodes/conq_explo1.html
>
> "The old naturalists were so sensitive and sympathetic to nature
that they
> could be surprised by the ordinary events of life. It was an
incessant
> miracle to them, and therefore gorgons and flying dragons were not
> incredible to them. The greatests and saddest defect is not
credulity, but
> our habitual forgetfulness that our science is ignorance."
> Henry David Thoreau, Journals, March 5, 1860.
------------------------ Yahoo! Groups Sponsor ---------------------~-->
FREE COLLEGE MONEY
CLICK HERE to search
600,000 scholarships!
http://us.click.yahoo.com/DlIU9C/4m7CAA/Ey.GAA/2gGylB/TM
---------------------------------------------------------------------~->
Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
