When observing a microbe in which one gene has been deleted, you often find that the product of the missing gene

is mutated.

Explanation:

any time a dna sequence is damaged or replaced it is known as a mutation.

thrombocytopenia, which is a deficiency in blood platelets, can cause bleeding and bruising in the dermis similar to senile purpura. other possible causes include: exposure to ultraviolet rays and aging skin are common causes of senile purpura. senile purpura may also be a sign of collagen loss in the skin and bones.