The essential information the product of the bicoid gene in Drosophila provides during development is (D) orientation of the anterior-posterior axis.
Bicoid is the maternal gene that acts as a morphogen. It expresses itself on the basis of its concentration gradient. The concentration of bicoid is high towards the anterior region, hence the region where bicoid protein is expressed les is the posterior portion.
Drosophila is the fruit fly commonly found in the households. It is one of the most studied model organism in developmental biology. This is because it can reproduce rapidly, has a relatively simple structure and is cost-effective.
Collar cells have a sticky funnel-shaped collar and a hair-like whip that is called the flagellum. A cell called an amebocyte takes the food picked up by a collar cell to other cells within the sponge. Collar cells are also called choanocytes
