parthanogenesis

Kim Timothy J tjk1846 at ucs.usl.edu
Sun Oct 10 18:21:45 EST 1993


In article <loats1.749942282 at husc9> loats1 at husc9.harvard.edu (James Loats) writes:
>johnreed at stein1.u.washington.edu (John Reed) writes:
>>I am interest in knowing whether parthanogenesis has evolved in the male 
>>sex of any species.  I would presume not, for evolutionary reasons, but I 
>>would like to know for sure.  I would also like to know other peoples 
>>opinions as to why this has not occured.  
>
>Well, my own opinion as to why this has/would not occur is more for
>physiological than "evolutionary" reasons:  males don't do parthenogenesis
>because if they did, they'd be called females.  My understanding is that
>"male" and "female" are defined in general by the relative motility of
>their gametes (i.e. "sperm/pollen" are motile, "eggs/ova" are not), and
>consequently, in those species which "give birth", by who bears the young
>or lays the egg.
>
>>My last question is simply: in 
>>what types of organisms does parthanogenesis occur?  I know it occurs in 
>>insects, what about other arthropods, plants (I believe it does), other 
>>animals, fungi?  Thanks for any replies.
>
>As far as plants go, I think the runners that plants such as strawberries
>and (I think?) grasses put forth by way of asexual reproduction are
>considered a form of parthenogenesis.  There is also a species of lizard
>that parthenogeneses (would that be the verb form?).  Probably there are
>more but I don't know of any.
>
>>--------------------------------------------------------------------------
>>John Reed
>
>
>--jim
>
>-- 
>Jim Loats                   * "I pass the test.  I shall diminish,
>loats1 at husc.harvard.edu     *  and go into the West, and remain
>Bacterial Motor Works--the  *  Galadriel."
>Ultimate Swimming Machine!  *             -- J.R.R. Tolkien



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