In meiosis, how would the gametes be affected if a pair of chromatids failed to separate in meiosis II?

Answer 1

Two gametes would be fine - the two from the other cell that didn't have this problem.

Two gametes would be affected. One would have one too many chromosomes and one would be missing one chromosome.

Answer 2

One gametes would have too many chromosomes, and one would have too few.

Usually these gametes are unviable (that is - they will not survive to grow into babies when fertilized). There are a few examples where they will actually survive, such as down's syndrome, where there are three copies of chromosome 21, or trisomy 18.

Answer 3

yes it would as the offspring would have a chromosome missing so the organism will be unstable