File talk:White bison by N A Nazeer.jpg
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Hi Richard, Could you explain a bit more why you remove this from Albinism?. I didn't understand what you mean by "this animal is clearly leucistic". JKadavoor Jee 02:46, 30 November 2013 (UTC)
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JKadavoor Jee 14:41, 30 November 2013 (UTC)
Leucism versus albuinism
[edit]I know that there is an old idea, that diluted colors belong to leucism and spotted animals is some sort of partial alminism. In fact albinism ist due to defects in the melanin synthese and diluted colors in most cases are too. Leucism is due to defects in the traveling of melanocytes and spotted colors are too. Therefore people who know the details of color genetics know that diluted colors are partisl albinism. Kersti (talk) 07:47, 8 May 2018 (UTC)
- [+Jkadavoor, +Shyamal, +Kersti Nebelsiek The above comment is moved from another page.--Praveen:talk 15:46, 8 May 2018 (UTC)]
Albino vs albinistic
[edit]Since this has been a contested issue in the past, here is my rationale for re-categorising this to "albinism in mammals":
- "albinism" refers to lowered function of pigment cells--resulting in diluted colouration
- albinistic skin will have pigment cells, but abnormal (deficient) pigment production
- albinism affects the pigment in the entire animal, although some types will dilute one pigment but not others
- "albino" is a special, "complete" case of albinism, usually understood to feature white to cream colouration with pink/red or pale blue/grey eyes in animals whose pigments only consist of melanins
- "leucism" refers to incomplete distribution of pigment cell precursors--resulting in variously white-spotted colouration
- leucistic patterns vary from complete whiteness (with blue or normal eyes) to small distal white markings in face and feet
- leucistic skin will be devoid of pigment cells (and therefore pigments) altogether, with other areas being unaffected
- leucism and albinism can and do co-occur (such as in this single cream dilute, tobiano-spotted pony).
Since the animal in question here is all over affected, features no stark white markings, and features a markedly diluted pigment in comparison to the unaffected specimen, I am moving this file back to Category:Albinism in mammals. --Pitke (talk) 10:39, 23 June 2020 (UTC)