Myasthenia gravis, is a disease that can't be cured treatment may help but it won't sure the disease.
The condition is caused by a breakdown in communication between nerves and muscles.Symptoms include weakness in the arm and leg muscles, double vision, and difficulties with speech and chewing.Medications, therapy, and surgery can help.
A) Due to the joining of the two gametes (sperm cell and egg which both have 23 chromosomes, the fertilised egg has 46 chromosomes) and because a skin cell is a normal cell (not a sex cell) it has 46 chromosomes.
You can automatically eliminate choice B because a zygote is the name for the cell produced when a sperm cell and egg joins, meaning it now has both 23 chromosomes from each of the sex cells, meaning it has 46 chromosomes. Sperm cells only ever have 23 chromosomes.
