Moi Noodle, je dirais juste que Albinos = pas de pigment et Amélanisme = pas de pigment noire...

C'est ce que j'ai dis à Rocky plus haut aussi, que les lettres ne changent rien, mais qu'habituellement, on utilise des lettres communes afin de se comprendre entre éleveurs, non? Pas chez les serpents?

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Pour de vrai, fait quelques lectures parce que Noodles avait raison

!!! !!!

Je viens de trouver quelle langue mon fils parle! Il ne me reste plus qu'à dechiffrer tout ca!

Comment vous expliquer que mon leucistique àles yeux bleu alors si leucistique ce ne'st aps de pigment du tout!
Albinos :pas de pigment du tout, leucistique: pas de pigment noir alors!!!

Comment vous expliquer que mon leucistique àles yeux bleu alors si leucistique ce ne'st aps de pigment du tout!

albino (amelanistique)= pas de pigment noir OU VRAIMENT TRÈS PEU
leucistique= pas de pigment du tout OU VRAIMENT TRÈS PEU

Witkop (1971) suggested that the 'yellow mutant' (ym) form of albinism first observed among the Amish (Nance et al., 1970) and later observed in non-Amish families (Witkop et al., 1971) may be distinct from both tyrosinase-positive and tyrosinase-negative albinism. As in type II albinism (203200), the homozygote is 'dead white' at birth, with serious ocular abnormalities, but rather rapidly develops normal skin pigmentation and yellow hair. The condition differs from albinism II in the yellow hair and the fact that incubation with L-tyrosine or L-DOPA yields equivocal results. 30 PubMed Neighbors

What is melanin pigment?
Melanin is a dark compound that is called a photoprotective pigment. The major role of melanin pigment in the skin is to absorb the ultraviolet (UV) light that comes from the sun so that the skin is not damaged. Sun exposure normally produces a tan which is an increase in melanin pigment in the skin. Many people with albinism do not have melanin pigment in their skin and do not tan with exposure to the sun. As a result, their skin is sensitive to the sun light and they develop a sun burn. In people with albinism, all other parts of the skin are normal even if there is no melanin in the skin.

The iris has melanin pigment and this makes the iris opaque to light (no light goes through an opaque iris). Iris pigment in albinism is reduced, and the iris is translucent to light, but the iris develops and functions normally in albinism.

The classification of OCA has changed a great deal over the years, with much of the work coming from the International Albinism Center and the help of all of the wonderful individuals and families who have helped with these studies. For many years, the term "albinism" referred only to people who had white hair, white skin, and blue eyes. Individuals who had OCA and pigmented hair and eyes were identified, particularly in the African and African-American population, and terms such as 'incomplete albinism', 'partial albinism' or 'imperfect albinism' were used for this, but these terms are inappropriate and are no longer used. In the 1960's, Dr. Carl Witkop developed the hairbulb incubation test to separate pigmenting and non-pigmenting types of OCA and started to use the terms "ty-neg" or "tyrosinase-negative" and "ty-pos" or "tyrosinase-positive" OCA. Freshly plucked hairbulbs from a person with OCA were placed in a solution of tyrosine or dopa (see Pathway above) in a test tube and watched to see if pigment formed in the pigment cells in the hairbulb. If no pigment formed, the test was negative and the diagnosis was ty-neg OCA. If pigment formed in the hairbulb, the test was positive and the diagnosis was ty-pos OCA. Although this simple test showed that there were different types of OCA, subsequent studies have shown that the hairbulb incubation test is not very sensitive and has many false negative and false positive responses. As a result, the hairbulb incubation test is no longer used in the evaluation of an individual with OCA.

Ty-Pos: Tyrosinase positive, which refers to a type of albinism in which hairbulbs incubated in a chemical solution of tyrosine make pigment. See text for details. Also called Type 2 albinism.

Yellow Albinism: A type of albinism similar to ty-neg albinism at birth. It is sometimes called "yellow mutant" albinism, though the term "mutant," which refers to a spontaneous (not inherited) change in genes, is inappropriate. This term is no longer used to classify albinism. See text for details.