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    Completely confused, please help with an explanation

    In garden pea plants the genes for height and
    flower colour are on different chromosomes.

    The allele T (tall) is dominant to the allele t
    (dwarf) and the allele R (purple flowers) is
    dominant to the allele r (white flowers).
    A true-breeding tall plant with purple flowers
    was crossed with a dwarf plant with white
    flowers.

    The F1 generation were self-pollinated and 64
    plants were obtained in the F2 generation.

    How many of the F2 generation would be
    expected to be tall with white flowers?

    A 36
    B 16
    C 12
    D 4
 
 
 
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Updated: May 11, 2015

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