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Genetic Puzzle: Fertility of Zebra hybrid

Equine-Reproduction.com Bulletin Board » Equine Genetics » Genetic Puzzle: Fertility of Zebra hybrid « Previous Next »


Author Message
 

bekele Megersa Bati
Neonate
Username: Bekem

Post Number: 1
Registered: 07-2006
Posted on Monday, July 17, 2006 - 05:14 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hello dears!!!
I have observed a male zebra hybrid (mare zebra x male donkey) produced offspring from female donkey under natural condition in Ethiopia. I am recording my obervations and looking for scientific justifications.
would please provide me the possiblities of this genetic puzzle?
thank you
Bekem
 

Jos
Board Administrator
Username: Admin

Post Number: 924
Registered: 10-1999
Posted on Friday, July 21, 2006 - 02:58 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

There is an excellent article available at Wikipedia on the subject that will I think answer much of your question. I take the liberty of reproducing a relevant section below - there is much else of interest in the article.

Donkeys and wild equids have different numbers of chromosomes. A donkey has 62 chromosomes; the zebra has 44. In spite of this difference, viable hybrids are possible provided the gene combination in the hybrid allows for embryonic development to birth. A hybrid has a number of chromosomes somewhere in between. The chromosome difference makes female hybrids poorly fertile and male hybrids sterile due to a phenomenon called Haldane's Rule. The difference in chromosome number is most likely due to horses having 2 longer chromosomes that contain similar gene content that contain the same genes as 4 zebra chromosomes.

McKinnnon and Voss' publication "Equine Reproduction" also carries a chapter on the subject that explores chromosomal issues in more depth.



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