Final answer:
An individual with an XXXY chromosome complement is a male with Klinefelter syndrome variant and would have three Barr bodies due to the inactivation of the three unnecessary X chromosomes.
Step-by-step explanation:
An individual with an XXXY sex chromosome complement is considered to be a male with a variation of Klinefelter syndrome. In humans, the presence of a Y chromosome typically determines male sex. However, in cases where there are multiple X chromosomes, as seen in this syndrome, all but one of the X chromosomes are inactivated and become Barr bodies. Therefore, with an XXXY complement, there would be three X chromosomes that are inactivated, resulting in three Barr bodies.
An individual with an XXXY sex chromosome complement has a genotype known as Klinefelter syndrome. This genotype corresponds to phenotypically male individuals with small testes, enlarged breasts, and reduced body hair. In this case, every X chromosome except one undergoes inactivation, resulting in the formation of several Barr bodies in each cell nucleus.