on 3/30/01 8:54 PM, Chris at [EMAIL PROTECTED] wrote:
> I'm trying
> to remember if snow would be an example of either incomplete or
> co-dominance.
are you talking about in corn snakes? It's neither incomplete dominance nor
co-dominance. it is the expression of two different genes, not two
different alleles of the same gene. It is the result of a dihybrid cross
(and you are right... the standard mendelian ratio would be 9:3:3:1 for the
F2.. thus 9 would appear normal, 3 would be amel. and 3 would be
anerythristic, but only 1 would be both traits at once... and thus snow...
you would only KNOW the genotype of the snow of course... the others could
easily... and some would be... heterozygous for the other character).
Co-dominant would be when two traits are both dominant and are both
expressed at the same time... like blood type AB or chocolate labs (more
complicated I've heard... many genes... may not be a good example).
incomplete penetrance would be when a recessive gene bleeds through... like
pink snapdragons.... red is dominant to white, but when you cross them you
get pink, to varying degrees.
Greg
--
Gregory J. Watkins-Colwell
Dept. of Biology
Sacred Heart University
5151 Park Avenue
Fairfield, CT 06432
and
Yale Peabody Museum
Dept. of Vertebrate Zoology
170 Whitney Ave
PO Box 208118
New Haven, CT 06520-8118
Fax 203-432-3758
###########################################################################
THE GLOBAL GECKO ASSOCIATION LISTSERV
WebSite: www.gekkota.com Archive: [EMAIL PROTECTED]/
The GGA takes no responsibility for the contents of these postings.
###########################################################################
