Question

What is the result of a mutation during meiosis?

Answer 1

Mutations during meiosis can often lead to disorders, diseases, etc.

Explanation:

Let's say that one of the tetrads formed in the first steps of meiosis I doesn't separate and goes on.

When making gametes, some will contain the necessary amount of chromosomes while others will not. [See Figure below.]
This is called non-disjunction.