Sonli umumiy o’rta ta’lim maktabining 9 sinf o’quvchisi

7	8	9	10	11	12	13	14
15
Javob
Tekshirish

To‘g‘ri javob: __________Ball:__________O‘qituvchining imzosi:___________ Sana _____________

6­ -laboratoriya mashg‘uloti.
Monoduragaychatishtirishga doir masalalar yechish

1. Tovuqlarda gulsimon toj dominant (A), oddiy toj retsessiv (a).

Tajribada gulsimon tojli tovuqlar oddiy tojli xo‘rozlar bilan chatishtirildi. F1 duragaylarning fenotipi va genotipi qanday bo‘ladi?
a) agar F1 o‘zaro chatishtirilsa, F2da qanday natija kutish mumkin?
b) F1 oddiy tojli xo‘rozlar bilan qayta chatishtirilsa-chi?
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2. Quyonlarda yungning normal uzunligi dominant (B), qisqaligi

retsessiv belgi (b) hisoblanadi. Quyidagi genotipga ega organizmlar
chatishtirilganda qanday fenotipli organizmlar olinadi?
Вb x Вb; ВВ x bb; Вb x ВВ.
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3. Pomidor mevasining qizil rangi (A) sariq rangi (a) ustidan

dominantlik qiladi. Tajribada urug‘chi va changchi organizmlar qizil rangga ega edi, lekin ular chatishtirilganda 3/4 qizil, 1/4 sariq
pomidor hosil bo‘ladi. ota-onaning va F1 duragaylarning genotipini
aniqlang.
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4. Gomozigota g‘o‘zaning hosil shoxi cheklanmagan (S) va cheklangan (s) formalari o‘zaro chatishtirildi. F1 va F2 avlodning genotipini va fenotipini aniqlang.

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