MICROANATOMY

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: -If one egg is fertilised by two sperm, it results in three sets of chromosomes, rather than the standard two-one from the mother and two from the father. And, according to researchers, three sets of chromosomes are “typically incompatible with life and embryos do not usually survive".

Detailed explanation-3: -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.