Write out the parents’ genotypes together ex. AABB X aabb Use the F O I L method to set up the test cross i u n a r t s s s s i t t i d d e e Draw the arrows for each parent for the FOIL method. An example is given below. A A B B X a a b b Set up the cross for both sides. AB Practice filling in the probable offspring below. AB AB AB AB AaBb To figure the phenotypic ratio, count the number of individuals with either the dominant or recesssive phenotype for both traits! Then that ratio would be something like 4:4:4:4 or 9:3:3:1
Write out the parents’ genotypes together ex. AABB X aabb Use the F O I L method to set up the test cross i u n a r t s s s s i t t i d d e e Draw the arrows for each parent for the FOIL method. An example is given below. A A B B X a a b b Set up the cross for both sides. AB Practice filling in the probable offspring below. AB AB AB AB AaBb To figure the phenotypic ratio, count the number of individuals with either the dominant or recesssive phenotype for both traits! Then that ratio would be something like 4:4:4:4 or 9:3:3:1
punnett_square_packet_2012__1_.docx