-- card: 30092 from stack: in -- bmap block id: 30665 -- flags: 0000 -- background id: 2665 -- name: -- part 1 (button) -- low flags: 00 -- high flags: 8003 -- rect: left=205 top=315 right=337 bottom=256 -- title width / last selected line: 0 -- icon id / first selected line: 0 / 0 -- text alignment: 1 -- font id: 0 -- text size: 12 -- style flags: 0 -- line height: 16 -- part name: NEXT ----- HyperTalk script ----- on mouseUp go to next card end mouseUp -- part 2 (button) -- low flags: 00 -- high flags: 8003 -- rect: left=149 top=314 right=337 bottom=199 -- title width / last selected line: 0 -- icon id / first selected line: 0 / 0 -- text alignment: 1 -- font id: 0 -- text size: 12 -- style flags: 0 -- line height: 16 -- part name: PREV. ----- HyperTalk script ----- on mouseUp go back end mouseUp -- part contents for background part 1 ----- text ----- CROSSES -- part contents for background part 2 ----- text ----- Right. You correctly identified the the two intermediate groups. Note the homozygous dominant and recessive classes are also identified. Although this demonstration is rather elementary, the value of the punnet square begins to prove itself when two independently segregating genes are studied. For that demonstration, flip to the next card.