A snapdragon plant that is pure-bred for white petals was crossed to a plant that is pure-bred for deeppurple?

All the F1 plants had white petals. The F1 plants were inbred to yield an F2 generation


with the following phenotypes:


P white X deep purple


F1 white


F2 white 1200


deep purple 300


light yellow 100


1600 Total


A. Based on these results, how many different genetic loci are involved in the production of petal


color in the snapdragon?


I have to explain my reasoning.





B. Using the symbols A and a for the alleles at one locus and the symbols B and b for the alleles at


the second locus, assign genotypes to:


1. The F1 plants:





2. The white plants in the F2 generation:





3. The original pure-bred white parent:

A snapdragon plant that is pure-bred for white petals was crossed to a plant that is pure-bred for deeppurple?
Your ratio = 12:3:1 shows that you have a case of dominant epistasis where 2 loci interact to affect the final phenotype and give a deviation from the expected 9:3:3:1. This is a common ratio and is explained with worked examples in the links below.





See cross 1 in this link http://www.agron.missouri.edu/mnl/76/52s...





http://www.ndsu.nodak.edu/instruct/mccle...





See slides 16 %26amp;17 in this link


http://www.csun.edu/~cmalone/pdf360/Ch04...








http://www.colorado.edu/MCDB/MCDB2150Fal...

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