"In simple, straightforward
diploids (that's a laugh!--genetics, even in diploids, is never simple)
chromosomes either pair two by two, or not at all, depending on the hybrid
status of the plant."
I said that wrongly.
Pairing is either two by two, partially paired (just as can occur in
tetraploids) or not at all.
Then, in the Punnett square for
a diploid cross, the pattern is in threes, not twos. I'm rather foggy
for a reason.
In diploids, each of the two
governing sides of the square have a pattern of AA, Aa, or aa.
In Tetraploids, the
possibilities are AAAA, AAAa, AAaa, Aaaa and aaaa, giving five
possibilities, so the square has twenty-five, not sixteen possible outcomes,
with the "cube" array 5 x 5 x 5 having 125 outcomes, not 64.
My apologies for needing to
correct the post.
Neil Mogensen ("Frequently Wrong
but Never in Doubt") in z 7 in western
NC
