The white spots can range in size and they decorate the wings. At the upper corner of the top set of wings are orange spots. The underside of the monarch butterflies' wings can be seen when the butterfly is at rest or when it is feeding on a flower. Instead of bright orange, the underside is more drab and orange-brown. Males and females can be told apart by looking at the top of their hind wings.
Freebase(0.00 / 0 votes)Rate this definition: A genetic disorder is an illness caused by one or more abnormalities in the genome, especially a condition that is present from birth. Most genetic disorders are quite rare and affect one person in every several thousands or millions.
Geneticists group genetic disorders into three categories: 1  Monogenetic disorders are caused by a mutation in a single gene. The mutation may be present on one or both chromosomes (one chromosome inherited from each parent). Examples of monogenic disorders are: sickle cell disease, cystic fibrosis, polycystic kidney disease, and Tay-Sachs disease.