3.17 understand that the sex of a person is controlled by one pair of chromosomes, XX in a female and XY in a male

3.17 •chromosomes determine your gender (sperm does since it has the ‘Y’)

                  •there are 23 matched paris of chromosomes in every human body cell 

                  •the last pair of chromosomes determine whether you turn out male or female

                  

        •equal chance being male or female

                  •the genetic diagram works for chromosomes and and genes