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  The topic is  Using what we ve learned .This topic is about taits,such  as curly red hair may,appear only once or twice in several generation.For example x and y chromosomes are chromosome tha determine a prson sex.The blood type is another human trait that is not simply dominant or recessive.it can be O BLOOD,AB blood.A ,B,BLOOD .

The differnt betwen an x and y chromosome are that the female inherit twwo xx an the male one x and one y.