K.C.S.E Biology Q & A - MODEL 2012PP2QN01
In a certain plant species which is normally green, a recessive gene for colour (n) causes the plants to be white in colour. Such plants die at an early age. In the heterozygous state, the plants are pale green in colour but grow to maturity.
(a) Give a reason for the early death of the plants with the homozygous recessive gene.
(b) If a normal green plant was crossed with the pale green plant, what would be the
genotype of the first filial generation (F1 generation)? Show your working.
(c) If heterozygous plants were self-pollinated and the resulting seeds planted, work out the
proportion of their offspring that would grow to maturity.