A slow heart rate is called bradycardia. Some irregular heartbeats are normal: 1  Sinus arrhythmia is the normal variation in heart rate that accompanies breathing in and out.  Sinus tachycardia is the normal increase in the heart rate that occurs in healthy people when they are excited, exercising, or have a fever.
There are four tabby patterns that have been shown to be genetically distinct: Mackerel, Classic, spotted, and ticked. A fifth includes tabby as part of another basic color pattern. The patched tabby is a calico or tortoiseshell cat with tabby patches (also known as caliby and torbie, respectively).All those patterns have been observed in random-bred populations. Several additional patterns are found in specific breeds.A modified Classic tabby is found in the Sokoke breed.he patched tabby is a calico or tortoiseshell cat with tabby patches (also known as caliby and torbie, respectively). All those patterns have been observed in random-bred populations. Several additional patterns are found in specific breeds. A modified Classic tabby is found in the Sokoke breed.
Keep in mind, though, the ultimately dominant cat fur color pattern is tabby. So for a cat to be solid black, it must also carry a recessive gene known as a non-agouti (a), so that the tabby pattern doesnât appear. Cats who have the dominant agouti gene will retain the tabby pattern. Which brings us to our next point.