A twin boy and girl may be identical, according to a study found on NCBI, although this situation is very rare Usually identical twins share the same gender they are either a pair or boys or girls In rare instances, however, identical twins form from an egg and sperm that begin as males (sharing XY chromosomes) then change to become a maleAnother site said that 1/3 of all twins are identical Others give different numbers If I take that first pair of numbers, we get the probability of two boys, or of two girls, is , and the probability of one of each is So each probability is about 1/3 That came from a quick search for frequencies of twins, just looking forI had an argument with a colleague who tried to claim her friends were identical boy/girl twins One is tall and blonde the other is short and brunette, plus you know, there's the highly nonidentical anatomy!
Dear Beyonce 11 Thoughts On Boy Girl Twins By Lizzie Siegle Medium
