Re: Iris Math
- To: Multiple recipients of list <i*@rt66.com>
- Subject: Re: Iris Math
- From: S* M* <7*@CompuServe.COM>
- Date: Sun, 9 Mar 1997 13:15:24 -0700 (MST)
Of the theoretical cross of two 1/4-breds, Linda Mann asked:
: Uh, why is it 0, 1/4 or 1/2 and not 0, 1/8 or 1/4?
The most likely product of a cross like this is -- nothing. But quarterbreds
can produce two types of viable gametes; 1) one set of aril chromosomes and one
set of nonaril chromosomes, or 2) two sets of nonaril chromosomes. In
shorthand: AB gametes and BB gametes.
The possible combinations are:
BBBB (nonaril) = 0
ABBB = 1/4
ABAB = 1/2
"1/8" implies a split set of chromosomes, an occurence I hesitate to deem
impossible but which has not been documented. I have made many crosses of this
type in the last 20 years and obtained a few seedlings, but none have yet made
it to bloom size so I won't speculate as to the relative probabilities.
Sharon McAllister
73372.1745@compuserve.com
