Explain how abnormal meiosis may lead to the genetic disorder of down's syndrome?

In fruit flies, gray bodies (g) are dominant over black bodies (g), and brown pigments (n) are dominant over yellow pigments (n). each individual possesses two alleles for each trait. if a fly that is homozygous dominant for both traits is crossed with a fly that is homozygous recessive for both traits, what is the predicted genotype of the offspring.

Name the types of burns one can get and which structures of the integument are damaged

Me the formula cacl2 represents the compound