Fill the gaps of the following paragraph taking appropriate words from the bracket (first, second, meiosis, mitosis, 1:1, 1:2, gametes, male, female, 50%, 100%). In human beings male has XY and female has XX chromosome complement. The sex chromosomes segregate during the (a) division of (b)_____ The X-chromosome constitutes (c) _____ of produced sperms and (d)____ of eggs. If randomly mated, the ratio of sex expression is (e) _____. The sex of the offspring is determined by (f)____ of (g) _____.