Unit04-Genetics-Genotypes&Phenotypes

[] -understanding dihybrid crosses. -Taryn

HETEROCHROMIA In anatomy, //**heterochromia**// refers to a difference in [|coloration], usually of the [|iris] but also of [|hair] or [|skin]. Heterochromia is a result of the relative excess or lack of [|melanin] (a [|pigment]). It may be [|inherited], due to genetic [|mosaicism], or due to [|disease] or [|injury].[|[1]] [|Eye color], specifically the color of the irises, is determined primarily by the concentration and distribution of melanin.[|[2]][|[3]][|[4]] The affected eye may be hyperpigmented (hyperchromic) or hypopigmented (hypochromic).[|[5]] In humans, usually, an excess of melanin indicates [|hyperplasia] of the [|iris] tissues, whereas a lack of [|melanin] indicates hypoplasia. Heterochromia of the [|eye] (//**heterochromia iridis**// or //**heterochromia iridum**//) is of two kinds. In //complete heterochromia//, one iris is a different color from the other. In //partial heterochromia// or //sectoral heterochromia//, part of one iris is a different color from its remainder. Partial or sectoral heterochromia is much less common than complete heterochromia and is typically found in [|autosomally] inherited disorders such as [|Hirschsprung's disease] and [|Waardenburg syndrome].



pretty helpful http://www.youtube.com/watch?v=ajSkHPJqYFc&feature=PlayList&p=9580D94F4FFB62CE&index=24&playnext=2&playnext_from=PL

[|Punnet Squares at the 1st Grade Level] -Cory Taylor

[|Dihybrid Cross Animation....Really Funny] -Cory Taylor

DNA Coiling to form chromosomes []

-Lizzie