What is the primary factor influencing the different types of cleavage observed among animals? Choose the best answer.

A DEV3011 student is interested in craniofacial development and whether neural crest cells derived from the dorsal neural tube contribute to forming the lower jaw. Which of the following would be the best developmental approach to addressing this question?

Choose the best answer.

You are a researcher studying a conserved gene that may play a role in forming a neuron that regulates appetite. A competitor is also working on the same gene and has the same hypothesis. What would be the quickest option to assess the effects of gene knock out? Choose the best answer.