In peas, yellow colour (y) is dominant to green colour (y). you are given a pea plant without knowing the colour of its peas. however, you are allowed to cross it with another plant of known coloured peas and observe their offspring. which of the following methods is/are guaranteed to enable you to determine whether the genotype of your unknown pea plant is yy, yy or yy? ( )
i. cross it with a green pea plant ii. cross it with a yellow pea plant that had two yellow parents iii. cross it with a yellow pea plant that had a green parent
a. i only
b. i and ii
c. i and iii
d. i, ii and iii