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These animals are usually sterile due to the different numbers of chromosomes between the two parents. The imbalance results in offspring that is viable but not fertile, as is the case with the mule. Sterility can also be caused by selective breeding, where a selected trait is closely linked to genes involved in sex determination or fertility.
A mule is a sterile hybrid of a male donkey and a female horse.Mules are smaller than horses but stronger than donkeys, making them useful as pack animals.. In biology, a hybrid is the offspring resulting from combining the qualities of two organisms of different varieties, subspecies, species or genera through sexual reproduction.
The mule is a domestic equine hybrid between a donkey and a horse.It is the offspring of a male donkey (a jack) and a female horse (a mare). [1] [2] The horse and the donkey are different species, with different numbers of chromosomes; of the two possible first-generation hybrids between them, the mule is easier to obtain and more common than the hinny, which is the offspring of a male horse ...
A Corolla mule was recently euthanized on Oct. 30 after a small scrotal hernia that occluded the ... He also traveled with mares and raised foals that weren’t his — since mules are sterile.
However, when hybrids are produced between both species, the gene flow between the two will continue to be impeded as the hybrid males are sterile. Also, and in contrast with the great vigor shown by the sterile males, the descendants of the backcrosses of the hybrid females with the parent species are weak and notoriously non-viable.
The Maysale Mule has existed for over 30 years—and has truly earned its title as a classic. T&C Tried & True: Why the Manolo Blahnik Maysale Mule Is The Ultimate Versatile Heel Skip to main content
Male mules (johns) are sterile, but fertile female mules (mollies) sometimes occur. [2] The different number and different structure in chromosomes makes it difficult for them to pair up properly. Donkeys have 62 chromosomes and horses have 64, so their hybrids (mules and hinnies) have 63. [2]
A male donkey (jack) crossed with a female horse produces a mule, while a male horse crossed with a jenny produces a hinny. Horse–donkey hybrids are almost always sterile because of a failure of their developing gametes to complete meiosis. [86] The lower progesterone production of the jenny may also lead to early embryonic loss. In addition ...
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