Question

Ionizing radiation, benzene, and certain viruses can each individually cause leukemia without the other two exposures, but only if the exposed individual has a certain genetic deficiency. This genetic deficiency by itself does not cause leukemia, but the disease never occurs in the absence of this genetic factor. The genetic deficiency is

Answer 1

The specific genetic deficiency that predisposes individuals to leukemia in the presence of ionizing radiation, benzene exposure, or certain viruses is not mentioned in the given information.

Step-by-step explanation:

The genetic deficiency that can result in leukemia when combined with ionizing radiation, benzene exposure, or certain viruses is not specified in the given information. However, it is mentioned that this deficiency by itself does not cause leukemia, but the disease never occurs in the absence of this genetic factor. Therefore, the specific genetic deficiency that predisposes individuals to leukemia in the presence of these exposures is not provided.

Answer 2

A necessary but not sufficient cause

Step-by-step explanation:

A necessary but not sufficient cause is defined as any cause/condition that is an obligate requirement for a particular event to occur (in this case, the particular event is leukemia disease), but it isn't sufficient for the occurrence of this event. Conversely, a sufficient cause is defined as any cause/condition that will cause by itself the event to occur. Finally, a condition is neither necessary nor sufficient when the condition neither is required nor sufficient for the event to occur.