BIOL 2153 : Test One Practice Questions Genetics
Document Summary
For questions 1-2, flower color in petunias is controlled by three independently-assorting genes (a, b, c), each with a dominant and recessive allele. The three genes interact in the following fashion to determine color: flower color symbol genotypes producing this color white yellow red purple. A multiply-homozygous purple petunia is crossed with a multiply-homozygous recessive white petunia and produced all purple f offspring. What phenotypic ratio (w : y : r : p) is expected if the f plants are self- fertilized to produce an f generation? (hint: the fork-line method would be much more time-efficient versus a. 1 : 12 : 24 : 27 none of the above (a-d) is correct. In petunias, the normal orange flower color is the result of a mixture of red and yellow pigments, which are synthesized in two separate biochemical pathways, as shown here: first pathway second pathway.
