Can anyone please explain the two graphs in the picture Plea

The Genetics of Axis specification i RNAs (C) hunchback mRNA. ANTERIOR bicoid mRNA. Cortex, mRNA. Grauzone, bicoid Staufen nanos caudal mRNA. mRNA. mRNA Bicoid protein Anterior Posterior Caudal protein (B) Early cleavage embryo proteins POSTERIOR nanos mRNA Oskar hunchback Hunchback mRNA. Nanos Caudal E Bicoid protein Pumilio Hunchback Nanos protein Anterior Posterior FIGURE 6.24 of posterior pattern generation by Drosophila maternal effect the genes, (Al Tho el anterior DNIA are deposited in the oocyte by

Solution

Answer:

Explanation of the two graphs:

1. The two figures, A and B, illustrate the concentrations of cytoplasmic polarity (maternal effect) mRNAs in the mature egg and the subsequence morphogen gradients after fertilization.

2. Notice that bicoid and nanos mRNA are localized to the anterior and posterior poles respectively, while hunchback and caudal mRNAs are distributed throughout the egg.

3. Fertilization triggers the translation of maternal mRNAs and the establishment of the anterior and posterior morphogen gradients of Bicoid and Nanos proteins.

4. Bicoid proteins represses the anterior expression of Caudal, while Nanos protein represses the posterior expression of Hunchback.

5. At the early cleavage stage you now see the four protein gradients that determine the allocation of anterior and posterior structures, i.e, Bicoid and Hunchback at the anterior and Caudal and Nanos at the posterior.