In case of garden pea, violet colour of flower is dominant over white colour. Therefore, the unknown garden pea plant which produces only violet coloured on flowers may be homozygous dominant having genotype WW or heterozygous having genotype Ww.
(b) The genotype of the particular garden pea plant can be ascertained by a test cross :
(i) If violet coloured flower plant has genotype WW: (ii) If violet coloured flower plant has genotypes Ws:
