hort.net Seasonal photo, (c) 2006 Christopher P. Lindsey, All Rights Reserved: do not copy
articles | gallery of plants | blog | tech blog | plant profiles | patents | mailing lists | top stories | links | shorturl service | tom clothier's archive0
Gallery of Plants
Tech Blog
Plant Profiles
Mailing Lists
    Search ALL lists
    Search help
    Subscription info
Top Stories
sHORTurl service
Tom Clothier's Archive
 Top Stories
New Trillium species discovered

Disease could hit Britain's trees hard

Ten of the best snowdrop cultivars

Plant protein database helps identify plant gene functions

Dendroclimatologists record history through trees

Potato beetle could be thwarted through gene manipulation

Hawaii expands coffee farm quarantine

Study explains flower petal loss

RSS story archive

Re: HYB: Punnett square question

> From: Donald Eaves <donald@eastland.net>
> MARY McCLELLAN is a disenrolled arilbred, being listed as 1/8 onco.
> The aril ancestry derives from the pod parent BLUE OX which was a
> cross of ACROPOLIS (I assume a TB?) x C.G. White oncobred (I
> assume a 1/4 bred?)  In order to put this in a Punnett square to
> calculate the odds of seedling resulting from a cross of MMc x 1/4 bred,
> would the following be correct?

Mary McClellan is listed as a 1/8 onco. Its parent BLUE OX was therefore a
1/4 bred (the other parent of MMc was CHIVALRY, a straight bred TB). BLUE
OX's parent were ACROPOLIS, a straight bred TB, and a C.G. White oncobred,
which would have been a 1/2 bred, not a 1/4 bred.
> AA AA AA Aa if 'A' is TB and 'a' arilbred?  Also, is there a standard
> method of putting the pod/pollen parents on a specific axis of the
> square?

I don't think you can represent MMc this way, since it is a tetraploid, not
an octoploid. MMc would be either AAAA or AAAa for a given tetrad of
chromosomes. Probabilistically half the chromosome tetrads would be of one
kind and half of the other. However, Sharon McAllister has stated that this
sort of quantum model does not very accurately represent the way in which
genetic material is passed down in interspecific crosses, if I understand
what she has tried to explain.

Jeff Walters in northern Utah  (USDA Zone 4/5, Sunset Zone 2, AHS Zone 7)

"Is It Time To Re-Establish Your Credit? Do You Have $900.00
Gross Monthly Income? Over 18? US Resident? No Credit Turndowns!
Apply Now For Your Magna Plus Visa Card."

 © 1995-2017 Mallorn Computing, Inc.All Rights Reserved.
Our Privacy Statement
Other Mailing lists | Author Index | Date Index | Subject Index | Thread Index