![]() ![]() If X-inactivation happens during this process then the cat will end up with 10 patches of colour, 5 red and 5 black, each of them derived from those initial cells.ĭevelopmental processes are influenced by environmental factors and other genes, so the final coat colour will depend on exactly when X-inactivation happens, exactly how far each cell has to move, and hundreds of other factors. They will move towards the outer layer of the organism, and start dividing again. For example, 10 cells may specialise to be melanocytes (a kind of cell that produces pigment). During development cells will start specialising according to the role they will end up playing. You might think that this would result in a uniform mixing of red and black hairs, but (as ever!) the situation is a bit more complicated than that. After X-inactivation, this means that some of her cells will produce red pigment, and some will produce black. (If this idea sounds strange to you then make sure you also read about chimerism !) Most of the time this isn’t noticeable, but in tortoiseshell cats it is right there for everyone to see! A tortoiseshell cat has inherited different colour alleles from their parents: she may have a red allele from her father and a non-red allele from her mother. Some of your body will be using your father’s X chromosome, and some of your body will be using your mother’s X chromosome. This means that if you are a female you are actually a ‘mosaic’ of different cells. Crucially this X-inactivation stays the same when these cells divide. So if you have 100 cells when X-inactivation happens, afterwards you will have ~50 cells with only the maternal X chromosome active, and ~50 cells with only the paternal X chromosome active. The zygote will start growing by making copies of its genetic information and then dividing so that each new cell will also contain a copy of the complete genome for that organism.įairly early in the development of a female the cells ‘switch off’ one of their X chromosomes in a fairly random way. The zygote contains the complete library of genetic information for that organism – half of it from the male parent and half from the female parent. Mammals start off as a single cell called a zygote – this is the cell that results when a female’s egg cell is fertilised by a male’s sperm cell. We haven’t covered the developmental process in this series (because it is an immensely complex subject area in its own right!) but we will cover a little now. The key part is that (in humans and cats) this inactivation is done at random, and at an early point in the developmental process. ![]() ![]() This involves ‘switching off’ one of the female’s X chromosomes. To avoid this situation mammals evolved something called ‘X-inactivation’. Because females have two copies of the X chromosome, whereas males only have one, you would expect females to produce twice as many X-chromosome gene products as males. …Whichever social network you prefer Facebook, Instagram, Twitter or Pinterest, this site is easy to follow for news on special offers, sales & new patterns.We discussed in a previous article that mammals have two copies of each chromosome aside from the sex chromosome. ![]() Sale is for the downloadable PDF pattern only – no material or threads are included!Īll sales are final Sleepy Kitten 2 cat cross stitch pattern created under CC0 license ModXStitch can be found on social media Thank you for visiting Modern Cross Stitch Not sure how the patterns stitch up or looking for inspiration? Why not check out the Finished Stitches gallery! I may be able to make it!Īnd I’m also in the process of creating diamond painting charts for my patterns but it is a lengthy process so if there’s a particular pattern you want to do in diamond painting, drop me a note here and I’ll pop it to the top of the list!ĭon’t know where to start then check out about the patterns for more info. If the design size or chart type you want is not listed please get in touch. The sale includes the B&W chart Design sizing Cross StitchĬross stitch pattern created using DMC colours & CXC colours (except the newer colours added since 2017) This adorable little sleepy kitten 2 is a cat cross stitch pattern which comes as a full coverage pattern and with no back-stitching.Īdditionally, sleepy kitten 2 is available in 1 different design sizes – cross stitch regular Sleepy Kitten 2 cat cross stitch pattern created under CC0 license ![]()
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