Daun sindromining rivojlanish sabablarini korsating.

A) spermatogenezning yetilish zonasida l meyozda bitta qutbga 2 ta 21 xromosoma tortiladi va 23 ta autosomali spermatozoid normal tuxum hujayrani uruglantiradi
B) spermatogenezning yetilish zonasida il meyozda bitta qutbga 21 xromosoma tortiladi va 22 autosomali spermatozoid normal tuxum hujayrani uruglantiradi
C) spermatogenezning yetilish zonasida DNK reduplikasiyasi sodir boladi va hosil bolgan spermatozoidlarning bittasi normal tuxum hujayra bilan qoshiladi
D) interkenez jarayonida DNK reduplikasiyasi sodir boladi, spermatogenezning yetilish zonasida II meyozda bitta polyusga 21 ta xromosoma tortiladi va hosil bolgan spermatozoid tuxum hujayrani uruglantiradi