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.
also called tropical zone or torrid zone, all the land and water of the earth situated between the Tropic of Cancer Tropic of Cancer,parallel of latitude at 23Â°30' north of the equator; it is the northern boundary of the tropics.lso called tropical zone or torrid zone, all the land and water of the earth situated between the Tropic of Cancer Tropic of Cancer,parallel of latitude at 23Â°30' north of the equator; it is the northern boundary of the tropics.