The controversy mostly originates from that fact that the studied embryonic stem cells come from human embryos, which raises a lot of ethical questions among people.
Explanation:
Meiosis is the formation of reproductive cells, like the egg in the fallopian tube; if not fertilized by sperm, it is expelled by the menstrual cycle.
Some conditions during fertilization can be disrupted by an egg attaching to the fallopian tube instead of the uterus causing an ectopic pregnancy. Arranging chromosomes in a different way causes congenital defects like color blindness, crohn's disease down's syndrome, etc.
A phenotype..............
Simple diffusion- movement of gas from high to low concentrations in lungs and etc.
Active transport- movement of large ions and molecules across cell from low to high concentrations.
Exocytosis- Exo exit the cell by waste and vesicles expel waste using ATP
Endocytosis- Endo means into the cell