What is a punnett square and how do i use it

A:       Punnett squares help scientists predict probability. Punnett squares are similar to a multiplication table, the genes of one parent are lined up across the top of the square and the genes of the other parent are lined up vertically on the left-hand side. By combining the genes from the top and side and placing them in their corresponding boxes, one can see possible gene combinations.

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).