Male XX and female XY sometime occurs due to transfer of segments in X and Y chromosomes .
in this case aneuploidy is not possible . because it means having fewer or extra chromosomes than normal genome number of the species.

Male XX and female XY can occur due to:

A) Transfer of segment in X and Y chromosome:
During the formation of reproductive cells (gametes), there can be errors in the process of crossing over, which is the exchange of genetic material between homologous chromosomes. This can result in a transfer of segments between the X and Y chromosomes. If a segment containing the SRY gene (which determines male development) is transferred from the Y chromosome to the X chromosome, the individual can develop as a male despite having two X chromosomes. Conversely, if a segment containing genes responsible for female development is transferred from the X chromosome to the Y chromosome, the individual can develop as a female despite having an XY karyotype.

B) Aneuploidy:
Aneuploidy refers to an abnormal number of chromosomes in an individual's cells. In the case of male XX and female XY, aneuploidy can occur due to errors during meiosis. For example:

1. Non-disjunction: Non-disjunction is the failure of chromosomes to separate properly during meiosis. If non-disjunction occurs during the formation of sperm cells, an X-bearing sperm can fertilize an X-bearing egg, resulting in an XX male. Similarly, if non-disjunction occurs during the formation of egg cells, a Y-bearing egg can be fertilized by a Y-bearing sperm, resulting in an XY female.

2. Chromosomal rearrangements: Structural abnormalities in the X and Y chromosomes can also lead to male XX and female XY individuals. For instance, if a portion of the Y chromosome carrying the SRY gene is translocated to one of the X chromosomes, an XX individual with male characteristics can be formed. Conversely, if a portion of the X chromosome containing genes responsible for female development is translocated to the Y chromosome, an XY individual with female characteristics can be formed.

In both cases, the atypical combinations of sex chromosomes can result in individuals with reproductive and physical characteristics that do not align with the typical XX female and XY male patterns. These occurrences are relatively rare but provide insights into the complex mechanisms involved in determining an individual's sex.