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genetics_into [2017/06/07 17:19] – beckergenetics_into [2023/01/25 22:20] – [What gives the Rex its remarkable coat?] becker
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 ====== An Illustrated Guide to Rabbit Coat Color Genetics* ====== ====== An Illustrated Guide to Rabbit Coat Color Genetics* ======
 //*with an emphasis on Rex Rabbits ([[:rex_standard|see the Un-Official Rex Standard here]])// //*with an emphasis on Rex Rabbits ([[:rex_standard|see the Un-Official Rex Standard here]])//
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    - The guard hairs carry the same **amount** of color as a regular length hair but they are considerably shorter. This means that the color of the hair appears more intense. Contrast that with long-coated rabbits like the angora when the same amount of color is spread out over a MUCH longer hair; these rabbits always appear to have pale colors.    - The guard hairs carry the same **amount** of color as a regular length hair but they are considerably shorter. This means that the color of the hair appears more intense. Contrast that with long-coated rabbits like the angora when the same amount of color is spread out over a MUCH longer hair; these rabbits always appear to have pale colors.
  
 +"The typical length of the single hair fiber of the Rex rabbit is 1.79–3.79 cm, with no statistically significant differences between hairs on various parts of the body (Tao 1994; Neirurerova et al. 2017). The diameter of the fiber is about 18–19 lm, and the hair density is 15 000–38 000 fibers/cm 2 (Tao 1994)."
  
 +Dorożyńska, K. and Maj, D. (2021), Rabbits – their domestication and molecular genetics of hair coat development and quality. Anim. Genet., 52: 10-20. https://doi.org/10.1111/age.13024\\
 +[[http://ojs.upv.es/index.php/wrs/article/view/213/200|Tao, Y.R. (2010). Studies on the quality of Rex rabbit fur. World Rabbit Science, 2, 21-24.]]
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 +[[https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0030073|LIPH Expression in Skin and Hair Follicles of Normal Coat and Rex Rabbits]]
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 +[[http://europepmc.org/articles/PMC1086272/reload=0;jsessionid=zPH4vIzDXeQu8KW69JjE.8?fbclid=IwAR2UYTFu8npROdmdJ0SKr_zeafNKmNROEwaP4sP5MjXW6GQW9khNkyfNE-4|Linkage Interrelations of Three Genes for Rex (Short) Coat in the Rabbit]]
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 +[[https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1209310/?fbclid=IwAR2itD1q68nKjaqhryNJrofVZoBT5MwhukjHUqQqGTKLoK-UvJP9Ix0jN1U|A Case of Neighboring Loci with Similar Effects]]
 ===== Basic Genetics ===== ===== Basic Genetics =====
  
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-==== COLOUR (Concentration) [ C / cchd / cchl / ch / c] ====+==== COLOR (Concentration) [ C / cchd / cchl / ch / c] ====
  
 This gene affects the intensity of melanin production in the coat hairs. The normal or dominant form, C, is what might be termed 'full color' concentration. There are however a number of incompletely dominant alleles on this locus, with varying effects on color intensity. At least some of these variant forms are temperature sensitive - the higher the temperature, the more effective they are (i.e, the lighter the color). This gene affects the intensity of melanin production in the coat hairs. The normal or dominant form, C, is what might be termed 'full color' concentration. There are however a number of incompletely dominant alleles on this locus, with varying effects on color intensity. At least some of these variant forms are temperature sensitive - the higher the temperature, the more effective they are (i.e, the lighter the color).
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 === Another Way to Look at It === === Another Way to Look at It ===
  
-The color concentration gene controls the amount of pigment in the hair; relative amounts shown as units of black 'B' and yellow( or red) 'Y' color. Imagine that the total amount of pigment in hair is the same for all hairs. As a result, shorter hairs appear darker (and also why long-haired varieties look faded). This explains the shading pattern found in seals, sables, torts, and the pointed colors. The color pattern of the chinchilla (c<sup>chd</sup>) is essentially the same as that for the agouti except that is lacks the reddish color in the mid-band.+The color concentration gene controls the amount of pigment in the hair; relative amounts shown as units of black 'B' and yellow( or red) 'Y' color. Imagine that the total amount of pigment in hair is the same for all hairs. As a result, shorter hairs appear darker (and also why long-haired varieties look faded). This explains the shading pattern found in seals, sables, torts, and the pointed colors. The color pattern of the chinchilla (C<sup>chd</sup>) is essentially the same as that for the agouti except that is lacks the reddish color in the mid-band.
  
 **C** = Normal **[BBBBYYY]**\\ **C** = Normal **[BBBBYYY]**\\
-**c<sup>chd</sup>** = Dark Chinchilla **[BBBBY--]**\\ +**C<sup>chd</sup>** = Dark Chinchilla **[BBBBY--]**\\ 
-**c<sup>chl</sup>** = Light Chinchilla [shaded : seal & sable] **[BB-----]**\\ +**C<sup>chl</sup>** = Light Chinchilla [shaded : seal & sable] **[BB-----]**\\ 
-**c<sup>h</sup>** = Himalayan **[BB-----]** (with an added temperature-sensitive feature that prevents pigment from forming on the hairs when the follicles are warmest.\\+**C<sup>h</sup>** = Himalayan **[BB-----]** (with an added temperature-sensitive feature that prevents pigment from forming on the hairs when the follicles are warmest.\\
 **c** = White [Albino : absence of color] **[-------]**\\ **c** = White [Albino : absence of color] **[-------]**\\
  
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 |{{genetics:ook-06-10-01.jpg?175|}}|{{genetics:louise-04-02-01.jpg?175|}}|{{ :genetics:yaa4-2016-04-15_19-38-06_wm.jpg?nolink&175 |}}|{{ :stock:xyz:zowie:zowie-2016-08-24_17-53-27_wm.jpg?nolink&175 |}}|{{ :stock:imports:turin:turin-2015-05-03_14-16-02_wm.jpg?nolink&175|}}| |{{genetics:ook-06-10-01.jpg?175|}}|{{genetics:louise-04-02-01.jpg?175|}}|{{ :genetics:yaa4-2016-04-15_19-38-06_wm.jpg?nolink&175 |}}|{{ :stock:xyz:zowie:zowie-2016-08-24_17-53-27_wm.jpg?nolink&175 |}}|{{ :stock:imports:turin:turin-2015-05-03_14-16-02_wm.jpg?nolink&175|}}|
-^  normal (C-)  ^  dark chinchilla (c<sup>chd</sup>-)  ^  shaded (c<sup>chl</sup>-)  ^  californian (c<sup>h</sup>-)  ^  white (cc)  ^+^  normal (C-)  ^  dark chinchilla (C<sup>chd</sup>-)  ^  shaded (C<sup>chl</sup>-)  ^  californian (C<sup>h</sup>-)  ^  white (cc)  ^
  
  
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 Bobby Schott, 1989, **Color Genetics of the Netherland Dwarf Rabbit**, Xavier Reference Publications, Douglasville Georgia Bobby Schott, 1989, **Color Genetics of the Netherland Dwarf Rabbit**, Xavier Reference Publications, Douglasville Georgia
  
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  • genetics_into.txt
  • Last modified: 2023/01/25 22:20
  • by becker