Issues of Cell Division on Human Health

Benign tumour

Not dangerous and can be removed surgically

Malignant tumour

Known as cancer

Factors that cause cancer

Radiation, chemical substances, carcinogens, genetic factors, bacteria and viruses

Factor that lead to the formation of tumours

Uncontrolled cell division

Down's syndrome

Caused by non disjunction of chromosomes during anaphase I or II

The development of breast cancer (1)

The tumour grows from a single cell

The development of breast cancer (2)

Cancer cells compete to get nutrients from other tissues around them

The development of breast cancer (3)

The cancer cells spread through the lymph vessels and blood vessels to other parts of the body

The development of breast cancer (4)

A new tumour develops on other organs

The number of chromosomes of an individual with Down syndrom

Has 47 chromosomes, which is an extra chromosome at the 21st set