punnett squares

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how would i make a punnet square to find the offspring of parents:
SsYy x ssyy

I don't understand what i would put for each of the boxes on the outside

  • punnett squares -

    SY
    Sy
    sY
    sy
    across the top
    sy sy sy sy

  • punnett squares -

    one parent is Ss Yy
    so put those two across the top
    -- Ss Yy

    ss

    yy

  • punnett squares -

    SY
    Sy
    sY
    sy
    across the top and bottom.

    Wouldn't the top be the same as the bottom? According to this genotype, the ratio will be 1:1:1:1

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