I am the "mail room" or "UPS Store" and aid in packaging and shipping proteins and nutrients. Who am I?

In flies, red eyes (R) are dominant to brown eyes (r). A heterozygote fly is crossed with a homozygous recessive fly. What percentage of offspring will have brown eyes?

Having attached earlobes (e) is recessive to unattached earlobes (E). A man with genotype (Ee) and a woman with attached earlobes have a child. What is the percent chance the child has attached earlobes?

In pigeons, normal feathers are dominant to frizzy feathers.

Two heterozygote pigeons mate with each other and produce offspring. What fraction of offspring will have normal feathers?