Fwd: Re: help anyone?????????

Arti_Patel at BAYLOR.EDU Arti_Patel at BAYLOR.EDU
Tue Oct 3 17:26:43 EST 1995



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Date: Tue, 03 Oct 1995 14:48:39 -0700 (PDT)
From: BIOSCI Administrator <biosci-help at net.bio.net>
Subject: Re: help anyone?????????
In-Reply-To: Your message of Mon, 02 Oct 1995 19:00:33 +0000
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To: Arti_Patel at baylor.edu
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> To Whom it May Concern:                  
> 
> My name is Arti Patel and i am currently a sophomore at Baylor University and 
I 
> would like information on this problem that is due as part of my genetics 
> test.My professor encouraged me to get on genetics talk around the nation and 
so 
> therefore I hope that I will find this successful. If at all possible I need 
the 
> solution to the problem by Tuesday night(October 3rd) so I can compare my 
answer 
> with yours. Thank you very much for your corporation.
> 
> 
> My e-mail address is Arti_Patel at baylor.edu
> 
> 
> Problem:
> A cross between a horse and a donkey produces a sterile mule.  Actually, it is 
a 
> cross between a female horse and a male donkey that produces the mule; the 
> reciprocal cross, between a male horse and a female donkey, produces a hinny, 
> which has smaller ears and a bushy tail like a horse.  Horses have 64 
> chromosomes, while donkeys possess only 62; as expected, mules ha a chromosome 
> number of 63.
> 
> In spite of the conventional wisdom that mules are sterile, reports of fertile 
> mules have surfaced over the years. In the summer of 1985 a female mule in 
> Nebraska named Krause, who was pastured with a male donkey, was observed with 
a 
> newborn foal.  Blood samples were collected from Krause and her male 
foal(Named 
> Blue Moon).  A team of geneticists led by Oliver Ryder at the San Diego Zoo 
> prepared karyotypes and analyzed 17 genetic markers from the blood samples.  
> Remarkably, the study of genetic markers revealed that Blue Moon inherited the 
> entire set of horse genes that were present in his mother.  Additional reports 
> of fertile female mules support the idea that their offspring inherit only 
horse 
> chromosomes from the mule.
> 
> It's been observed that when the father of a mule's offspring is a horse, the 
> offspring are horse-like in appearance.  However, when the father of a mule's 
> offspring is a donkey, the offspring are mule-like in appearance.  (A)Explain 
> how these observations are consistent with the hypothesis that the offspring 
of 
> a mule inherit only horse genes from their mother, (B)propose a mechanism for 
> how the offspring of a mule could inherit the entire set of horse genes from 
its 
> mother.
> 
> 

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