the animal you refer to would be a chimera
this is aparently a geep:
http://www.skewsme.com/cloning/geep_c.jpg
quote below it states: The chimeric animal shown [above] is a baby “geep”, made by combining a goat and sheep embryo. Notice the chimerism evident in the skin — big patches of skin on front and rear legs are covered with wool, representing the sheep contribution of the animal, while a majority of the remainder of the body is covered with hair, being derived from goat cells.
— “Mosaicism and Chimerism,” at http://arbl.cvmbs.colostate.edu/ hbooks/ genetics/ medgen/ chromo/ mosaics.html
In biological research, chimeras are artificially produced by mixing cells from two different organisms. This can result in the eventual development of an adult animal composed of cells from both donors, which may be of different species — for example, in 1984 a chimeric geep was produced by combining embryos from a goat and a sheep. A chicken with a quail's brain has been produced by grafting portions of a quail embryo into a chicken embryo.
from wikipedia hybids:
Interspecific hybrids
Interspecific hybrids are bred by mating two species, normally from within the same genus. The offspring display traits and characteristics of both parents. The offspring of an interspecific cross may be sterile. Sterility is often attributed to the different number of chromosomes the two species have, for example donkeys have 62 chromosomes, while horses have 64 chromosomes, and mules and hinnies have 63 chromosomes. Mules, hinnies, and other normally sterile interspecific hybrids normally cannot produce viable gametes because the extra chromosome cannot make a homologous pair at meiosis, meiosis is disrupted, and viable sperm and eggs are not formed. However, fertility in both female mules and hinnies has been reported with a donkey as the father.[2]
While it is possible to predict the genetic composition of a backcross on average, it is not possible to accurately predict the composition of a particular backcrossed individual, due to random segregation of chromosomes. In a species with two pairs of chromosomes, a twice backcrossed individual would be predicted to contain 12.5% of one species' genome (say, species A). However, it may, in fact, still be a 50% hybrid if the chromosomes from species A were lucky in two successive segregations, and meiotic crossovers happened near the telomeres. The chance of this is fairly high, 1/2^(2×2)=1/16 (where the "two times two" comes about from two rounds of meiosis with two chromosomes); however, this probability declines markedly with chromosome number and so the actual composition of a hybrid will be increasingly closer to the predicted composition.
Hybrids are often named by the portmanteau method, combining the names of the two parent species. For example, a zeedonk is a cross between a zebra and a donkey. Since the traits of hybrid offspring often vary depending on which species was mother and which was father, it is traditional to use the father's species as the first half of the portmanteau. For example, a liger is a cross between a male lion and a female tiger, while a tigon is a cross between a male tiger and a female lion.
Some animal interspecies hybrids are:
Mule, a cross of female horse and a male donkey.
Hinny, a cross between a female donkey and a male horse.
A "Zeedonk", a zebra/donkey hybridZeedonk or zonkey, a zebra/donkey cross.
Zorse or zebroid, a zebra/horse cross
Zony/zetland, a zebra/pony cross ("zony" is a generic term; "zetland" is specifically a hybrid of the Shetland pony breed with a zebra)
Dzo, zo or yakow: a cross between a domestic cow/bull and a yak. See also Bovid hybrids.
Beefalo/cattalo, a cross of an American Bison and a domestic cow. This is a fertile breed; this along with genetic evidence has caused them to be recently reclassified into the same genus, Bos. See also Bovid hybrids.
Zubron, a hybrid between Wisent (European Bison) and domestic cow.
Sheep-goat hybrids, such as the Toast of Botswana.
Ursinae hybrids, such as the Grizzly-polar bear hybrid, occur between black bears, brown bears, Kodiak and polar bears.
Fertile Canid hybrids occur between coyotes, wolves, dingos, jackals and domestic dogs. Dogs and wolves may be considered the same species, making wolfdogs a non-hybrid.
Hybrids between Black & White Rhinos have been recognized.
Hybrids between spotted owls and barred owls
Ligers and Tigons (crosses between a Lion and a Tiger) and other Panthera hybrids such as the Lijagulep. Various other wild cat crosses are known involving the Lynx, Bobcat, Leopard, Serval, etc.
Bengal cat, a cross between the Asian Leopard cat and the domestic cat, one of many hybrids between the domestic cat and wild cat species. The domestic cat, African wild cat and European wildcat may be considered variant populations of the same species (Felis silvestris), making such crosses non-hybrids.
Cama, a cross between a Camel and a Llama, also an intergeneric hybrid.
Wolphin, a fertile but very rare cross between a False Killer Whale and a Bottlenose Dolphin.
A fertile cross between an albino King Snake and an albino Corn Snake.
At Chester Zoo in the United Kingdom, a cross between African elephant (male) and Indian elephant (female). The male calf was named Motty. It died of gut infection after twelve days.
Cagebird breeders sometimes breed hybrids between species of finch, such as Goldfinch x Canary. These birds are known as Mules.
Guin-hen, a hybrid between Chickens & Guineafowl, an interfamilial hybrid.
Pea-guinea, a hybrid between Peafowl & Guineafowl, an interfamilial hybrid.
Hybrids should not be confused with chimaeras such as the chimera between sheep and goat known as the geep.
where as chimeras:
a chimera is an animal which has two or more different populations of genetically distinct cells that originated in different zygotes; if the different cells emerged from the same zygote, it is called a mosaicism. It is either acquired through the infusion of allogeneic hematopoietic cells during transplantation or transfusion or it is inherited. In fraternal twins, chimerism occurs by means of blood-vessel anastomoses. Chimeras are named after the mythological creature Chimera.
Chimeras are formed from either four parent cells (two fertilized eggs or early embryos are fused together) or three parent cells (a fertilized egg is fused with an unfertilized egg or a fertilized egg is fused with an extra sperm). Each population of cells keeps its own character and the resulting animal is a mosaic of mis-matched parts. An analogy is two jigsaw puzzles cut using an identical cutter, but with different pictures. You can make a single puzzle out of the mis-matched parts, but the completed puzzle will show parts of both different pictures. Chimeras can often breed, but the fertility and type of offspring depends on which cell line gave rise to the ovaries or testes.
but i don't think there's any pictures of cowsheep..
2006-08-02 04:58:41
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answer #7
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answered by elf 2
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