Huntington's disease is an inherited disorder that affects the brain. It is caused by a dominant allele.
The family tree shows the inheritance of Huntington's disease in a family.
Complete the table using the information in the family tree:
- Number of people who will develop Huntington's disease: 4
- Number of people who are homozygous recessive for this gene: ___________
- Number of people who are heterozygous for this gene: ___________
Person A and Person B are expecting another child. Complete a genetic diagram (using HHH for the dominant allele and hhh for the recessive allele) to find the probability that this child will develop Huntington's disease.
This type of Huntington’s disease is a genetic disease. Give one reason why genetic diseases are classified as non-communicable.
Huntington's disease is caused by an abnormal protein produced in the brain. Scientists are working on a treatment using artificial monoclonal antibodies designed to target this specific protein.
Explain why the body does not naturally produce its own antibodies against the abnormal huntingtin protein.
Suggest two reasons why some people are opposed to testing new medicines on animals.