The following coat colors are determined by alleles at one locus in horses: palomino = golden ...

The following coat colors are determined by alleles at one locus in horses:
   palomino = golden coat with lighter mane and tail
   cremello = almost white
   chestnut = brown
 
  The following table gives ratios obtained in matings of the above
 
  varieties:
   Cross Parents Offspring
   1 cremello  cremello all cremello
   2 chestnut  chestnut all chestnut
   3 cremello  chestnut all palomino
   4 palomino  palomino 1/4 = chestnut
   1/2 = palomino
   1/4 = cremello
 
  Assign gene symbols for the genetic control of coat color on the basis of these data. Diagram the last two matings.