What is the typical outcome for individuals with Klinefelter Syndrome?

Individuals with Klinefelter Syndrome typically have an extra X chromosome in their genetic makeup, resulting in a 47,XXY karyotype. This chromosomal abnormality often leads to the development of undeveloped testes, resulting in hypogonadism and subsequently lower levels of testosterone. Due to these hormonal imbalances, individuals may exhibit features typically associated with females, such as breast development (gynecomastia) and broader hips. Additionally, they may have reduced facial and body hair and may be taller than average.

The phenotype of Klinefelter Syndrome can also include cognitive and behavioral challenges, but the hallmark characteristics are primarily around reproductive and physical development, which aligns with the choice indicating undeveloped testes and potential female characteristics. Thus, this option accurately reflects the typical outcomes observed in males with Klinefelter Syndrome.