Sperm cells from a man can be either x or y(x-female,y- male) while eggs from woman is x ie female.
The two joined together is called zygote where by
Xyzygote-male
xxzygote-female
Y-sperm cells are fast and swim faster across the cervix. Also y sperm cells die faster.
X-sperm cells are heavy and swims slowly also xsperm cell survives longer.
So Intercourse some days before ovulation would likely yield x+x fusion I.e female. While intercourse after ovulation have higher probability of x+y fission I.e male.so it is important to know qgwn best to have sex to Increase the probability of having or desired gender.
Twins if obe egg split I to two where by each grows I to a baby we have identical twins who have same looks same sex and same genes.o. the other hand non side rival twins is the result of two eggs being fertilized by two sperm at the same time hence they may have different t sex and may not look alike.
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