In Mendel's experiments, crossing a pea plant bearing yellow-coloured peas with a plant bearing green-coloured peas gave plants that all had yellow-coloured peas. If these plants were allowed to self-pollinate and 500 peas were collected from them, how many would be green-coloured?

Correct option is B

In Mendel's experiment, when a yellow pea plant (Yy) is crossed with a green pea plant (yy), all the offspring in the first generation (F1) will have yellow peas because yellow (Y) is dominant over green (y). However, these F1 plants (Yy) carry the green allele (y).
When the F1 generation (Yy) plants self-pollinate, the F2 generation will have the following ratios:
· 25% YY (yellow)
· 50% Yy (yellow)
· 25% yy (green)
Thus, 25% of the F2 plants will have green peas (yy). In a sample of 500 peas, 25% of 500 = 125 peas would be green-colored. However, since 125 is not an option, the closest estimate is around 110 green peas, which matches option (b).