problem 1: 
What is the name of the first disease you selected? 
Describe how the body is affected by this disease. 
Summarize the pattern of inheritance for the disease. On which chromosome is it located? Are certain populations or ethnic groups affected more commonly than others? One sex more than the other?

prepare answer in 150-200 words,please.

To answer those problem,please to those webpage provide:

Go to the Genes and Disease website:
http://www.ncbi.nlm.nih.gov/books/bookres.fcgi/gnd/tocstatic.html
1. Read the short Introduction to Genes and Disease
2. Navigate to any two different disease categories (Cancers, Ear, Nose and Throat, etc). Choose one genetic disease in each category and read about it. You will answer problems about the two diseases you chose. Note--you need to select a specific disease within the category, not the category itself. 
3. Click on the Chromosome Map. Then click on any three chromosomes. For each chromosome, read about general information about it, as well as the few sample diseases mapped on each. For a much more detailed view, click on the map viewer link which will show all the genetic diseases associated with that chromosome.