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[Cha. Sa. ShariraSthana 8/15],[Cha. Sa. IndriyaSthana 1/8],[Su. Sa. ShariraSthana 2/37]
[Cha. Sa. ShariraSthana 8/15],[Cha. Sa. IndriyaSthana 1/8],[Su. Sa. ShariraSthana 2/37]
== Inheritance of varna ==
<p style="text-align:justify;">The disorders of various body systems affect varna. E.g. disorders in rakta dhatu (blood and its components) results in skin discolouration and diseases.[Cha. Sa. Sutra Sthana 28/11-13] [Su. Sa. Sutra Sthana 24/11]Skin diseases have detrimental effect on varna. Rakta dhatu in its optimum quantity and quality leads to superior complexion. Similarly,presence of optimum body and scalp hair, cutaneous blood vessels, too affect the varna. The health of liver, spleen and other digestive organs is important to maintain a normal varna. These organs like heart, liver, spleen areoriginated from maternal factors, while some like hair, blood vessels, etc are contributed by paternal factors.[Ast. Hri. ShariraSthana 3/4-5]Thus varna of child is believed to be inherited from parents. Contemporary science believes that three classes of genes contribute to normal human color variation through the production of hypopigmented phenotypes or by genetic association with skin type and hair color. The MSH cell surface receptor and the melanosomal P-protein are the two most obvious candidate genes influencing variation in pigmentation phenotype, and may do so by regulating the levels and activities of the melanogenic enzymes tyrosinase, TRP-1 and TRP-2. Varna being regulated by genes may indicate its inheritance from parents.<ref name="ref1">Sturm R, Box N, Ramsay M. Human pigmentation genetics: the difference is only skin deep. doi:10.1002/(SICI)1521-1878(199809)20.</ref> </p>