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The horse (Equus ferus caballus) [2] [3] is a domesticated, one-toed, hoofed mammal. ... Horses have 64 chromosomes. [38] The horse genome was sequenced in 2007.
The list of organisms by chromosome count describes ploidy or numbers of chromosomes in the cells of various plants, animals, protists, and other living organisms.This number, along with the visual appearance of the chromosome, is known as the karyotype, [1] [2] [3] and can be found by looking at the chromosomes through a microscope.
The horse genome is larger than the dog genome, but smaller than the human genome or the bovine genome. [2] It encompasses 31 pairs of autosomes and one sex chromosome pair. [3] As horses share over 90 hereditary diseases similar to those found in humans, the sequencing of the horse genome has potential applications to both equine and human ...
Przewalski's horse has some biological differences from the domestic horse; unlike domesticated horses and the tarpan, which both have 64 chromosomes, Przewalski's horse has 66 chromosomes due to a Robertsonian translocation. [78] However, the offspring of Przewalski and domestic horses are fertile, possessing 65 chromosomes. [79]
For example, donkeys have 62 chromosomes, horses have 64 chromosomes, and mules or hinnies have 63 chromosomes. Mules, hinnies, and other normally sterile interspecific hybrids cannot produce viable gametes, because differences in chromosome structure prevent appropriate pairing and segregation during meiosis , meiosis is disrupted, and viable ...
A hybrid will have a number of chromosomes exactly halfway between that of its parents; for example, a cross between a horse (64 chromosomes), and a plains zebra (44 chromosomes), will produce a zebroid offspring with 54 chromosomes.
Both horses and donkeys belong to the genus Equus, but Equus caballus has 64 chromosomes, while Equus asinus only has 62. A cross will produce offspring (mule or hinny) with 63 chromosomes, that will not form pairs, which means that they do not divide in a balanced manner during meiosis. In the wild, the horses and donkeys ignore each other and ...
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] Zebras have between 32 and 46 (depending on the species) and their hybrids are sterile and infertile.