Answer the 4 questions appropriately. With each question I have provided 2 links

Answer the 4 questions appropriately. With each question I have provided 2 links that you must read or understand. These links will help you answer the 4 questions. Please do not use any other website to answer these questions. You may only use the links I have provided to answer these 4 questions. Each question must be answered in minimum 200 words to maximum 500 words. It is up to the tutor how much he wants to write. Thank You.
1- Describe two different cases of neural tube defects and the result.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3060005/?tool=pubmedhttp://www.ncbi.nlm.nih.
Answer the 4 questions appropriately. With each question I have provided 2 links that you must read or understand. These links will help you answer the 4 questions. Please do not use any other website to answer these questions. You may only use the links I have provided to answer these 4 questions. Each question must be answered in minimum 200 words to maximum 500 words. It is up to the tutor how much he wants to write. Thank You.
1- Describe two different cases of neural tube defects and the result.
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3060005/?tool=pubmedhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC3060005/?tool=pubmed
http://www.ncbi.nlm.nih.gov/pubmed/20923742http://www.ncbi.nlm.nih.gov/pubmed/20923742
2- What genes are essential for the formation of the mammalian neural tube?
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2688898/?tool=pubmedhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC2688898/?tool=pubmed
http://www.ncbi.nlm.nih.gov/books/NBK10080/http://www.ncbi.nlm.nih.gov/books/NBK10080/
3- In a chick embryo why does the head region undergo neurulation before the tail region?
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2882656/?tool=pubmedhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC2882656/?tool=pubmed
http://www.ncbi.nlm.nih.gov/books/NBK10080/http://www.ncbi.nlm.nih.gov/books/NBK10080/
4- What is the first step of primary neurulation and what is the importance of it.
http://www.ncbi.nlm.nih.gov/pubmed/6731331http://www.ncbi.nlm.nih.gov/pubmed/6731331
http://www.ncbi.nlm.nih.gov/pubmed/7167749http://www.ncbi.nlm.nih.gov/pubmed/7167749
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