GENERAL HISTOLOGY

Detailed explanation-1: –For the nearly 5, 000 sperm that make it into the utero-tubal junction, around 1, 000 of these reach the inside of the Fallopian tube.-For the 1, 000 sperm entering the tube, only around 200 actually reach the egg.-In the end, only 1 lucky sperm out of this group of 200 actually penetrates and fertilizes the egg!

Detailed explanation-2: -It takes just one sperm to fertilize a woman’s egg. Keep in mind, though, for each sperm that reaches the egg, there are millions that don’t. On average, each time men ejaculate they release nearly 100 million sperm.

Detailed explanation-3: -Occasionally, two sperm are known to fertilize a single egg; this ‘double fertilization’ is thought to happen in about 1% of human conceptions. An embryo created this way doesn’t usually survive, but a few cases are known to have made it-these children are chimaeras of cells with X and Y chromosomes.

Detailed explanation-4: -If more than one sperm fuses-a condition called polyspermy-multipolar or extra mitotic spindles are formed, resulting in faulty segregation of chromosomes during cell division; nondiploid cells are produced, and development usually stops. Two mechanisms can operate to ensure that only one sperm fertilizes the egg.

Detailed explanation-5: -Ba-da-boom. Seriously though, the short and sweet answer is this: the 200 to 600 million sperm normally found in ejaculate increases the chance that some will reach a mature egg, eventually with just one being able to enter and fertilize it.