Which of the following cell types has the highest proliferative ability in adults?

When does meiosis begin in male germ cells?

Which of the following is NOT true of embryonic haematopoiesis?

Cranial neural crest cells form some of the skull bones, without a cartilage intermediate. What is this process called?

Choose the CORRECT option below

Match the following types of signalling to an example of where it is used in the body: 

A researcher wants to use Crispr-CAS9 to knockout a gene, and study the impact of the gene loss on blood cell development.  

What are the components of Crispr-Cas9 system that the researcher needs to use?  Select all options that apply.

Which of the following cell types is/are derivatives of neural crest cells?  Select all that apply.

From which structure do blood cells and endothelium arise?

Match the following components of the cell to their function: 

Looking at the image of a cross section through a developing embryo below: 

What names are given to, and what derivatives are formed by the structures labelled F?  Select all options that apply.