Stephanie conducts an experiment to study sex reversal in a specific grographic location. She collects cells from newborn babies and examines them under a microscope over seven years. Among 6,100 newborn males, three have one Barr body, and all other babies have no Barr body. Among 6,300 newborn females, four have two Barr bodies and the rest have one. What of the following statements is not true? 1. About 0.5 % of boys have an additional X chromosome, so they have forty-seven chromosomes. 2.  Barr body is a small and dense structure of inactivated X chromosome. 3. Nondisjunction could produce an altered number of sex chromosomes.  4. Having an unusual number of Barr bodies indicates that the organism has more than two X chromosomes.

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