During the early development of identical twins, the split usually occurs within the first:

What is an example of a consequence of a gain-of-function mutation in a gene that regulates cell division?

Which of the subsequent C. elegans genes controls the anterior-posterior axis during embryonic development?

In which part of the Drosophila embryo do the germ cells form?

The bicoid (bcd) gene is involved in the development of the anterior-posterior axis of the Drosophila embryo. If the concentration gradient of bicoid protein is traced, it shows a _______ trend from the embryo's anterior end towards the posterior end.

Mutation of the bicoid gene can cause development failure of the anterior segment of the developing Drosophila embryo. However, it can only be expressed when: