a heterozygous white (bb) yearly is crossed with homozygous white ship (bb)
black_and_white_warbler is bird. black_and_white_warbler is not bird. white_winged_vampire_bat is not bat. white_rook is not rook. white_winged_vampire_bat is mammal. white_winged_vampire_bat is not vampire_bat. white_winged_vampire_bat is vampire_bat. black_sox is white_sox. white_rook is not white_chess_piece. white_winged_vampire_bat is not mammal.