K.C.S.E Biology Q & A - MODEL 2004PP1QN12

K.C.S.E Biology Q & A - MODEL 2004PP1QN12

Across between a red flowered plant and white flowered produced plants with pink flowers.
Using letter R to represent the gene for red colour , and W for white colour
a) What were the parental genotypes 
b) Workout a cross between F1 plants 
c) Give the i) Phenotypic ratio of F2 plants 
ii) Genotypic ratio of F2 plants 
d) Name a characteristic in humans, which is controlled through a mammalian heart?

answers

  (a) RR        WW
(b) Parental genotypes               R                     W
         Gametes                               R W     X       WW
                                                                R W
Fertilization
Offsprings                                       RR RW RW WW
(c) (i) Phenotypic ration Red Pink White
1 2 1
(ii) 1RR : 2RW; 1WW
(d) (ABO) blood grouping; blood groups;