Chinese Crested Dog 毛主席~~~ The Chinese Crested Dog is a smaller (10–13 lbs) hairless breed of dog. Like most hairless dog breeds, the Chinese Crested comes in two varieties, both with and without fur, which are born in the same litter: the Hairless and the Powderpuff. At first glance, the "Hairless" and "Powder 結婚puff" varieties of Chinese Crested Dogs appear to be two different breeds, but hairlessness is an incomplete dominant trait within a single breed.[1] The Hairless has soft, humanlike skin, as well as tufts of fur on its paws ("socks") 訂做禮服 and tail ("plume") and long, flowing hair on its head ("crest"). In addition to being an incomplete dominant gene, the "hairless" gene has a prenatal lethal effect when homozygous[2]. Zygotes affected with double hairless genes (1 in 4) never develop i 辦公室出租nto puppies, and are reabsorbed in the womb. All hairless Cresteds are therefore heterozygous .The Hairless variety can vary in amount of body hair. Fur on the muzzle, known as a beard, is not uncommon. A true Hairless often does not have as much furnishings (hair on the head, 酒店打工 tail, and paws). The difference between a very hairy Hairless and a Powderpuff is that the Hairless has a single coat[3] with hairless parts on the body, while the Powderpuff has a thick double coat. The skin of the Hairless comes in a variety of colors, ranging from a pale flesh to black. Hairl 太平洋房屋ess Cresteds often lack a full set of premolar teeth, but this is not considered a fault.[4] The look of the Powderpuff varies according to how it is groomed. When its fur is completely grown out on its face, it strongly resembles a terrier ; however, the Powderpuff is usually shaved around the snout as a standard c 有巢氏房屋ut.The amount of body hair on the hairless variety varies quite extensively, from the true hairless which has very little or no body hair and furnishings, to what is called a 'hairy hairless', which if left ungroomed often grows a near-full coat of hair. These hairy hairless are not a mix between powderpuffs and hairless Chinese Crest 酒店經紀eds, but are merely a result of a weaker expression of the variable Hairless gene. The mutation responsible for the hairless trait was identified in 2008.[5] One famous Chinese Crested dog was the hairless purebred named Sam, was the winner of the World's Ugliest Dog Contest from 2003 to 2005. He died before he could compete in 2006. Other Chinese Cresteds h 景觀設計ave finished high in the event as well.[6] The Hairless allele (the wild type) is a dominant (and homozygous prenatal lethal) trait, while the Powderpuff allele acts as a simple recessive trait in its presence. Zygotes that receive two copies of the Hairless allele will never develop into puppies. Thus all Chinese Cresteds carry at least one copy of the Powderpuff allele.T 室內裝潢he Powderpuff trait cannot be bred out because it is carried by all Chinese Cresteds (even the hairless ones). All Hairless Chinese Crested have the ability to produce Powderpuff puppies, even when they are bred to another Hairless. On the other hand, Powderpuffs bred to another Powderpuff can never produce hairless puppies, since they do not carry the Hairless gene.這樣說來~~毛主席真的只剩基因庫多樣性價值?住商房屋F!!!  .
創作者介紹

弦子

ccfgvy 發表在 痞客邦 PIXNET 留言(0) 人氣()