A.Pea Plant Can Be Prevented From Self-Pollinating By The Process Of Emasculation.
Emasculation is the technique in which the male parts of the flowers(stamens and anthers) are carefully removed before the flower matures.
Cross-pollination occurs from flower of one plant pollinates the flower of another plant.Cross - Pollination occurs naturally or manually by rubbing the pollens from one plant onto the stigma of the flower of another plant

B.No Mendelian Trait and genes are not similar as mendelian traits are passed because of genes.
genes and traits are very dissimilar