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ATTESATASIYA KITOBI 1
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2. Ulotriksni jinsiy ko`payishida 128 ta gameta hosil bo`lgan bo`lsa shu gametaning 50% dan zigota hosil bo`lgan zigotaning 25% dan ulotriks iplari hosil bo`ldi. Qancha ulotriks iplari hosil bo`lgan? A)64 B)32 C)128 D)16 Yechimi 2 ta gametadan 1 ta zigota hosl boladi 1 ta zigotadan 4 ta ulotriks ipi hosil bo`ladi 128 ta gametadan 128 /2 = 64 ta zigota hosil bo`lishi kerak edi, lekin 25% dan zigota hosil bo`lgan 64 --- 100 % X ---- 25 % x = 16 ta zigota 32 ta zigotaning 50 % da nip hosil bo`ldi 16 ------ 100 % X -------- 50 % x= 8 Bitta zigota 4 ta ulotriks ipi hosil qiladi 8 x 4 = 32 ta ip hosil bo`ladi Javob: B 3. Ulotriksni jinsiy ko`payishida 512 ta gameta hosil bo`lgan bo`lsa shu gametaning 25% dan zigota hosil bo`lgan zigotaning 50% dan ulotriks iplari hosil bo`ldi. Qancha ulotriks iplari hosil bo`lgan? A)64 B)128 C)32 D)16 Yechimi 2 ta gametadan 1 ta zigota hosl boladi 1 ta zigotadan 4 ta ulotriks ipi hosil bo`ladi 256 ta gametadan 512 /2 = 256 ta zigota hosil bo`lishi kerak edi, lekin 25% dan zigota hosil bo`lgan 256 --- 100 % X ---- 25 % x = 64 ta zigota 32 ta zigotaning 50 % da nip hosil bo`ldi 64 ------ 100 % X -------- 50 % x= 32 Bitta zigota 4 ta ulotriks ipi hosil qiladi 32 x 4 = 128 ta ip hosil bo`ladi Javob: B 4. Ulotriksni jinsiy ko`payishida 64 ta gameta hosil bo`lgan bo`lsa shu gametaning 50% dan zigota hosil bo`lgan zigotaning 50% dan ulotriks iplari hosil bo`ldi. Qancha ulotriks iplari hosil bo`lgan? A)32 B)16 C)8 D)64 Yechimi 2 ta gametadan 1 ta zigota hosl boladi 1 ta zigotadan 4 ta ulotriks ipi hosil bo`ladi 256 ta gametadan 64 /2 = 32 ta zigota hosil bo`lishi kerak edi, lekin 50% dan zigota hosil bo`lgan 32 --- 100 % X ---- 50 % x = 16 ta zigota 32 ta zigotaning 50 % da nip hosil bo`ldi 16 ------ 100 % X -------- 50 % x= 8 Bitta zigota 4 ta ulotriks ipi hosil qiladi 8 x 4 = 32 ta ip hosil bo`ladi Download 4.39 Mb. Do'stlaringiz bilan baham: |
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