Re: HYB: punnett squares for TBs (Facebook discussion)
iris@hort.net
  • Subject: Re: HYB: punnett squares for TBs (Facebook discussion)
  • From: L* M* <l*@lock-net.com>
  • Date: Sat, 08 Feb 2014 11:37:04 -0500
Chuck, do you know if that has been observed for other iris genes - patterns, rebloom, pigments? 

Is 1/576 as high as the probability for this type of event gets?

On 2/8/2014 8:32 AM, Chuck Chapman wrote:

One of the special features of tetraploid genetics is the possibility of
doubling up on a gene that is present only once. something that is not
shown or predicted in a punnett square.

This happens as  chromosomes are doubled during meiosis, so you are
choosing from 8 choices, not four.  So  you can, for example, get a
plicata from a cross  where there is only one plicata gene in each
parent.  Kidd calculated this to be 1/576, if  plicata genes is at a
distance from kinitochore of the gene [chromosome?] it is on. Lower if it is close to
kinitichore.  Kidd used some data from Keith Keppel to show that it does
happen and is not just a theory.

Chuck Chapman


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