“These other chromosomes contain genes that affect hair color, pattern, shape and length,” Grahn says. Robert Grahn, a forensic analyst at the veterinary genetics laboratory at the University of California in Davis. But a number of additional chromosomes are present and vary depending upon species, says Dr. As you may recall from high school biology, mammals have two chromosomes that determine their sex-XX for females and XY for males. The color of a cat’s coat is closely linked to its gender. Most orange cats are male and most calicos are female. And you’re certain that the orange tabby cat you want to adopt at the cat shelter is a boy. Call (847) 290-5806 or visit always assumed the calico cat that sits in your neighbor’s window is a she. Its mission is to provide immediate safety and care to stray and abandoned cats and dogs. Seegers Road, Arlington Heights, is an all-volunteer, nonprofit organization with all funds directly assisting its animals. Admission includes two games of bowling, shoe rental, pizza, salad, dessert and soda. Admission is $30 in advance for adults ($35 at the door) and $15 for children ages 12 and younger. Join The Buddy Foundation at Bowling for Buddy from 1:30-4:30 p.m.Torie and calico cats in general earn their spots from a series of gene mutations. The dilution genes are responsible for these lighter colorations. Tortie and calico felines also come in an array of color combinations such as cream, blue, lilac and fawn. In that instance, we have a totally white animal - but not an albino. In an extreme case, a feline may not have any pigment to its skin. The later the pigment migration, the more likely our feline will be patched with significant amounts of white fur. A spotting gene produces white, unpigmented patches by delaying pigment color to the skin's surface. In tortie with white felines, another genetic factor comes into play. A good example of a breed of ticked feline is the Abyssinian. Ticking occurs when each hair can have both colors. This can cause a ticking pattern to the fur. The cells have less time to compete against each other if you will. If the X inactivation occurs later, the brindle will be more intricate because the cells have less time to interact and less room to multiply. What next determines the pattern of the coats for brindled or patchy? Pigment colored genes that arrive early usually produce brindle because they have more time to interact with each other. When the second X is inactivated, the black color appears. On the other hand, if she only inherits one O gene, she will be tortoise. If a female has two O genes, she will be red. The formation of red and black coloration in a female is called X chromosome inactivation. Tortie and calico coats result from a combination of genetic and developmental factors in the embryo. Typically, they will not have any white and will be less patchy than a tortie with white. Torties are usually felines that have brindled, bicolor coats, wherein the colors are intricately intermingled. Tortoiseshell markings (tortie) can be found in specific breeds of cats, as can tortie with white. I wondered what change in genetic makeup determines a predisposition for a tortoiseshell cat or a tortoiseshell cat with white (a tri-colored coat), otherwise termed calico? When I was last at the shelter, I noticed the beautiful array of coat colors and patters on our felines. She has become more outgoing and willing to play and eat treats from your hand. Gemma is a female tortie, who was very shy when she first arrived at Buddy.
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