Test coming up around the end of the week   Chap reviews p 228-29  Q 2,3,4,5,6,9,10,11,12 p 256-57  Q 2,3,6,7,9,14,15 Be able to explain the difference between indentical and fraternal twins.   Can both be different sexes, why or why not? Unit review p 260 Q 1 a-d, f_i   , 2 b,f,g,h,i,j, 3,4,5, 6