Hyper IgE syndrome is rare with less than 850 cases reported worldwide. It affects both boys and girls equally. It is due to genetic mutation in the gene on chromosome 4. In some cases, the genetic mutation has not been identified.
Report Abuse. The tropical zone is characterised by strongly monsoonal weather patterns, distinct wet and dry periods which are highly reliable, large quantities of rain and high intensity rainfall, high temperatures, and high rates of energy transformation.
The tropical region (23.5 degrees N to 23.5 degrees S) is the only region where the sun can be directly overhead. The center of the tropics is the equator.1 person found this useful. Edit. closed mind is like a closed book; just a block of wood, anyone for Tea :). The southern border of Ethiopia is a few hundred miles north of the equator.