Final answer:
The XXXY condition is a form of Klinefelter syndrome, which can lead to health issues and reduced fertility but is not typically lethal. This differs from dominant lethal conditions like Huntington's disease and recessive lethal conditions like Tay-Sachs that can be passed down or result in early death respectively.
Step-by-step explanation:
The condition XXXY is always lethal in humans is No. The XXXY chromosome arrangement is a variation of Klinefelter syndrome, which is not typically lethal. Klinefelter syndrome is a condition where males have an extra X chromosome in most of their cells. Affected individuals can live normal lives, although they may encounter certain health issues and often have reduced fertility.
In contrast, dominant lethal conditions, such as Huntington's disease, may cause death, but not before reproductive age, allowing such genes to be passed on. Recessive lethal conditions like Tay-Sachs result in early death if the child inherits two faulty alleles. While certain genetic conditions can be lethal if both parents pass on the recessive allele for the disorder, the XXXY condition falls under the non-lethal category.