Transcript Document

Featured plant genetics topic of local and timely interest:
The 2014 GMO Ballot Measure
http://www.nwfoodnews.com/2011/02/18/meet-the-sugar-beet/
http://www.nwfoodnews.com/2011/02/18/meet-the-sugar-beet/
Focusing on a plant: Roundup Ready sugar beets
in the Willamette Valley
Beta vulgaris
2n = 2x = 18
~758 Mb (the haploid (n) genome size, by convention)
http://www.nwfoodnews.com/2011/02/18/meet-the-sugar-beet/
Oregon's organic farmers fight
genetically modified seeds
by Scott Learn, The Oregonian
Friday October 31, 2008, 9:52 PM
Seed production:
Blue = male
Red = female
Seed production:
Blue = male
Red = female
Genotype: RR
Phenotype: resistant
Genotype: 00
Phenotype: susceptible
http://www.crystalsugar.com
Pair of homologous chromosomes
Each has R gene
Showing only 1 pair of the 9 pairs
of chromosomes (2n = 2x = 18)
Pair of homologous chromosomes
Each missing R gene
Showing only 1 pair of the 9 pairs
of chromosomes (2n = 2x = 18)
R
R
The “R”* locus (same position on
each homologous chromosome)
2 copies of the R gene; each copy is
one allele
0
0
The R locus (same position on each
homologous chromosome)
2 copies of the absence of the R gene;
each copy is one allele
More on the transgene conferring resistance to glyphosate
meiosis
R
Male
R
gamete
meiosis
R
R
0
Female
gamete
0
0
0
R
R
0
R0
R0
0
R0
R0
All F1 progeny plants are R0
Resistant (R is dominant to 0)
R
0
R
RR
R0
0
R0
00
F2 plants
3 Resistant: 1 susceptible
1 RR: 2 R0: 1 00
RR – select a resistant type (if you want)
Genome editing – TALENs; CRISPRs and…….