#sindromlardan
Klaynfelter sindromi bilan kasallangan o'g'ilning onasida gametagenezning qaysi bosqichida xromosomalarning qutblarga no'to'gri taqsimlanishi kuzatiladi?
A) I meyoz bolinishdan keyin yonaltiruvchi tanachaga 24ta, tuxum hujayraga 22ta xromosoma otganda
✅
B) I meyoz bolinishdan keyin yonaltiruvchi tanachaga 22ta, tuxum hujayraga 24ta xromosoma otgandaC) II meyoz bolinishdan keyin yonaltiruvchi tanachaga 24ta, tuxum hujayraga 22ta xromosoma otganda
D) II meyoz bolinishdan keyin yonaltiruvchi tanachaga 22ta, tuxum hujayraga 24ta xromosoma o'tganda
Agar ovogenezning yetilish davrida yo'naltiruvchi tanachaga 22 ta (22+0) va tuxum hujayraga 24 ta (22+XX) xromosomalar tarqalgan va ular normal spermatozoid bilan urug'lansa, avlodda qanday genotip hosil bo'lishi mumkin?
A) 44+X0; 44+Y0
B) 44+X0;
C) 44+X0; 44+XXX; 44+XXY; 44+0Y
✅D) 44+XXX; 44+XXY☝️Izox 2n=46
🙍♀
anormal ovogenez. 🔘 44XX
. / \ / \
🔘 ° 22+XX 22+O
/ \ /\ / \ / \
🔘 ° ° ° 22XX 22XX 22 22
🙎♂
normal spermatogenez. 🔘 44XY
. / \ / \
🔘 🔘 22+X 22+Y
/ \ / \ / \ / \
🔘🔘🔘🔘 22X¹ 22X 22Y² 22Y
22XX(t) + 22X¹(s) = 44XXX¹
22XX(t) + 22Y²(s) = 44XXY²
t - tuxum hujayra 📌
s - spermatozoid 📌
1-X trisomiya; 2-klayfentir
Kanalga ulanish:
@Biopromax