Afriend of yours claims to have identified a gene that causes a human disease! your friend says that they have sequenced the dna of someone with the disorder and compared that to a healthy individual. they found a nucleotide difference in a gene called hsr12 that encodes a protein whose function is cell-to-cell communication. what is wrong with your friend's claim?

Point mutation is easily reversible, thus non-lethal

Explanation:

Point mutation is caused by exchange of a single nucleotide for another. These change is called

1) Transition (when a purine base substitute another purine base, or pyrimidine bases substitute each other)

2) Transversion (when a purine base substitute a pyrimidine base).

However, note that a point mutation can be easily reversed by another point mutation; so, the claim that a nucleotide difference in the Hsr12 gene caused the human disease is inaccurate

The daughter cells for mitosis are identical, for meiosis are different cuz crossing over has occurred.

events that occur in meiosis, but NOT mitosis include homologous chromosomes that are pairing/crossing over along in the metaphase plate.