Formative Practice 6.4 (Form 4 Biology Textbook Exercise and Answer)

Question 1:
Explain why radiotherapy is used to control or stop the growth of cancer cells.

Radiotherapy (RT) is a method used to treat cancer. This method uses high-powered ionising radiation to kill cancer cells. A high dose administration is administered to the target (tumor) to heal, control or reduce symptoms of the patient. However, adjacent parts may also be exposed to radiation which can lead to side effects.

Question 2:
Nondisjunction conditions in humans can cause genetic diseases such as Down syndrome. State the number of chromosomes and the characteristics that are found in an individual with Down syndrome.

An individual with Down syndrome has 47 chromosomes. This syndrome can cause intellectual disability, slanted eyes and a protruding tongue.

Leave a Comment