instance_of tiger horse
The ___MASK53___ complex is a group of genetically - related ___MASK22___ patterns in horses . These patterns range from progressive increases in interspersed white hair similar to graying or roan to distinctive , Dalmatian - like ___MASK53___ spots on a white ___MASK22___ . Secondary characteristics associated with the ___MASK53___ complex include a white sclera around the eye , striped hooves and mottled skin . The ___MASK53___ complex genes are also linked to abnormalities in the eyes and vision . These patterns are most closely identified with the Appaloosa ___MASK70___ , though its presence in breeds from Asia to western Europe has indicated that it is due to a very ancient mutation . Tiger horses are gaited , spotted horses with a ___MASK22___ color much like the Appaloosa . The tiger horse can exhibit various ambling gaits including various lateral gaits called the `` Glider Gait '' or Indian shuffle , stepping pace , and running walk , as well as the diagonal Fox Trot . Registered horses must exhibit gaits without artificial aids and while flat - shod . A ___MASK70___ is a selectively bred population of domesticated horses , often with pedigrees recorded in a breed registry . However , the term is sometimes used in a very broad sense to define landrace animals , or naturally selected horses of a common phenotype located within a limited geographic region . Depending on definition , hundreds of " breeds " exist today , developed for many different uses . Horse breeds are loosely divided into three categories based on general temperament : spirited " hot bloods " with speed and endurance ; " cold bloods ," such as draft horses and some ponies , suitable for slow , heavy work ; and " warmbloods ," developed from crosses between hot bloods and cold bloods , often focusing on creating breeds for specific riding purposes , particularly in Europe . Equine recurrent ( periodic ) uveitis ( moon blindness , recurrent iridocyclitis ) is an acute , nongranulomatous ___MASK100___ of the uveal tract of the eye , occurring commonly in horses of all breeds , worldwide . The causative factor is not known , but several pathogeneses have been suggested . It is the most common cause of blindness in horses . In some breeds , a genetic factor ___MASK38___ be involved . In ___MASK20___ , a mutation is the permanent alteration of the nucleotide ___MASK92___ of the genome of an ___MASK14___ , virus , or extrachromosomal DNA or other genetic elements . Mutations result from errors during DNA replication or other types of damage to DNA , which then ___MASK38___ undergo error - prone repair ( especially microhomology - mediated end joining ), or cause an error during other forms of repair , or else ___MASK38___ cause an error during replication ( translesion synthesis ). Mutations ___MASK38___ also result from insertion or deletion of segments of DNA due to mobile genetic elements . Mutations ___MASK38___ or ___MASK38___ not produce discernible changes in the observable characteristics ( phenotype ) of an ___MASK14___ . Mutations play a part in both normal and abnormal biological processes including : evolution , cancer , and the development of the immune system , including junctional diversity . A ___MASK57___ is a locus ( or region ) of DNA which is made up of nucleotides and is the molecular unit of heredity . The transmission of genes to an ___MASK14___ ' s offspring is the basis of the inheritance of phenotypic traits . Most biological traits are under the influence of polygenes ( many different genes ) as well as ___MASK57___  environment interactions . Some genetic traits are instantly visible , such as eye colour or number of limbs , and some are not , such as blood type , risk for specific diseases , or the thousands of basic biochemical processes that comprise life . The Appaloosa ( also known as Southwest to Sonora ) is a 1966 American Western ___MASK51___ Technicolor ( set in the 1870s ) from Universal Pictures starring Marlon Brando , Anjanette Comer and John Saxon , who was nominated for a Golden Globe for Best Supporting Actor for his portrayal of a Mexican bandit . The ___MASK51___ was directed by Sidney J . Furie , and shot in Wrightwood , Antelope Valley , and Lake Los Angeles , California , St . George , Utah , and Colorado ___MASK61___ , Arizona . The Appaloosa is an American ___MASK70___ best known for its colorful spotted coat pattern . There is a wide range of body types within the breed , stemming from the influence of multiple breeds of horses throughout its history . Each horse ' s color pattern is genetically the result of various spotting patterns overlaid on top of one of several recognized base coat colors . The color pattern of the Appaloosa is of interest to those who study equine coat color genetics , as it and several other physical characteristics are linked to the leopard complex mutation ( LP ). Appaloosas are prone to develop equine recurrent uveitis and congenital stationary night blindness ; the latter has been linked to the leopard complex . Equine ___MASK22___ color genetics determine a horse ' s ___MASK22___ color . There are many different ___MASK22___ colors possible , but all colors are produced by the action of only a few genes . The simplest genetic default color of all domesticated horses can be described as either " red " or " non - red ", depending on whether a gene known as the " Extension " gene is present . When no other genes are active , a " red " horse is the color popularly known as a chestnut . Black ___MASK22___ color occurs when the Extension gene is present , but no other genes are acting on ___MASK22___ color . The " Agouti " gene can be recognized only in " non - red " horses ; it determines whether black color is uniform , creating a black horse , or limited to the extremities of the body , creating a ___MASK76___ horse .