why is the progeny always tall when a tall pea plant is crossed with a short pea plant?

Yes exactly, your friends are right.

The gene for Tallness is dominant over the gene for dwarfness. So in the presence of the dominant gene the gene for dwarfness does not express itself.

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it is because in every of the four progeny cases there is a dominant T gene.so as it is dominant all plants are tall:

TT * tt = Tt , Tt , Tt , Tt

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thanks prathyusha :)

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well if i would just write '' it is because the tall pea plant is dominant over the short pea plant '' den it would be correct?

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