In 1665, Robert Hooke , while observing thin slices of cork under a microscope observed that the cork slice was made up of small compartments. He called these compartments CELL. Robert Hooke invited the cells that form the basic structural and functional units of an organism. Hope this helps....
If the sperm gametes that fertilizes an egg has an XX chromosomes, it will form female offspring. X is a female, XY is a female, Y is a male and XX is a female.
