First thing you have to realise is that all mules are NOT sterile. Most mules certainly are, but there have been numerous authenticated accounts of mules giving birth to perfectly healthy foals. Next thing to do is to ignore those people sa...
http://answers.yahoo.com/question/index?qid=20060605144...
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Is it because all mules are a certain sex, or they ... So why are mules sterile? That’s pretty complicated and to be quite honest we still don’t know the whole story. The basic problem is that after the ancestors of donkeys and horses split the chromosomes of BOTH species fused and then those fused chromosomes re-split.
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answers.yahoo.com/question/index?qid=20060617082352AADx...
answers.yahoo.com/question/index?qid=20060617082352AADxND6
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name Amy status student age 17 Question - Why are mules and hinnies sterile? Mules and hinnies are crossbred between 2 species: donkeys which have 62 chromosomes and horses which have 64 chromosomes. Donkey and horse chromosomes also differ slightly in structure.
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www.newton.dep.anl.gov/askasci/vet00/vet00004.htm
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Both male and female mules have all the correct "parts" but they are sterile and cannot reproduce. A VERY few (about 1 in 1 million) mare mules have had foals, but these are VERY, very rare. No male mule has ever sired a foal.
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www.lovelongears.com/about_mules.html
www.lovelongears.com/about_mules.html
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There are many wild horses and burros in the western U.S., and some people wonder why there are no mules. This is because they are entirely the product of artificial insemination, between a stallion and a jenny (female donkey). Mules may be...
http://www.blurtit.com/q951624.html
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Q: Why are mules sterile? A: Both mules and hinnys are thought to be sterile due to the chromosome (genetic material) make up of their parents. A horse has 32 chromosome pairs and a donkey has 31 pairs. When you mate two animals of different species, such as a horse and donkey you take half the # of pairs.
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www.sowhatchetmulefarminc.com/information.htm
www.sowhatchetmulefarminc.com/information.htm
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Some seedless fruits come from sterile triploid plants, with three sets of chromosomes rather than two. The triploid seeds are obtained by crossing a fertile tetraploid (4n) plant with a diploid (2n) plant.
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waynesword.palomar.edu/hybrids1.htm
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A mule combines the traits of its horse dam and donkey sire to create a new animal with its own distinctive characteristics. Here are the notable differences between horses, donkeys, and mules. ... The mule is a sterile hybrid, yet occasionally a mare mule will be fertile. The difference between the numbers of chromosomes...
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www.ruralheritage.com/mule_paddock/mule_compare.htm
www.ruralheritage.com/mule_paddock/mule_compare.htm
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Why are mules sterile? Obviously we know that they are. The standard explanation is: that's what happens when you cross breeds that aren't similar enough. Fine. What are the particulars? Thank you for all answers. ... Mules are phenotypically normal males and females, but the problem arises when they try to...
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www.natscience.com/Uwe/Forum.aspx/bio/306/Why-are-mules...
www.natscience.com/Uwe/Forum.aspx/bio/306/Why-are-mules-sterile
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