The gene combination of purple flowered pea plants is denoted as (WW) and that of white flowered pea plants as (ww), when these two plants are crossed $F_1$ generation is obtained. (a) List two observations made by Mendel in $F_1$ generation plants. (b) Give the (i) percentage of white flowered plants and (ii) ratio of the gene combinations WW, Ww and ww in $F_2$ generation. (c) Write one difference between dominant and recessive trait.

(a) Two observations made by Mendel in F1 generation plants are: (i) all plants were tall, and (ii) all plants had purple flowers. (b) (i) The percentage of white flowered plants in F2 generation is 25%. (ii) The ratio of the gene combinations WW, Ww, and ww in F2 generation is 1:2:1. (c) One difference between dominant and recessive trait is that dominant trait is expressed when an individual has one copy of the dominant allele, while recessive trait is expressed when an individual has two copies of the recessive allele.