Final answer:
Juvenile Huntington's disease often presents with rigidity and bradykinesia, as opposed to the chorea seen in adult-onset Huntington's. It also causes balance and posture problems, and there's a 50% chance of passing the disorder to children if one parent is affected.
Step-by-step explanation:
Unlike adult-onset Huntington's disease, which presents with chorea, juvenile Huntington's disease much more commonly presents with rigidity and bradykinesia (slowed movements). Juvenile Huntington's disease leads to the progressive breakdown of brain cells, culminating in various symptoms such as balance and posture problems, repetitive motor behaviors, difficulty with planning and executing tasks, poor judgment, and personality changes. The condition is a genetic disorder and using a Punnett square, it can be determined that there is a 50 percent chance that Huntington's disease will be passed on to offspring if one parent carries the mutation.