9-sinf. O`zbekistonning turli viloyatidagi biologiya o`qituvchilari tomonidan tuzilgan testlar

D) X xromosomaga birikkan dominant genga

7. Shabko’rlik odamlarda A vitamin yetishmasligi bilan bog’liq bo’lgan kasallik bo’lib, ayollarda erkaklarga nisbatan ikki barobar ko’p uchraydi. Kasal ayolning otasi ham kasal. Kasallik otadan o’g’ilga o’tmaydi. Geterozigotali ona va kasal ota oilasida tug’ilgan farzandlarning yarmi kasal. Ushbu kasallikning irsiylanishi qanday genga bog’liq?

A) autosomaga birikkan retsessiv genga

B) X xromosomaga birikkan retsessiv genga

C) autosomaga birikkan dominant genga

D) X xromosomaga birikkan dominant genga

8. Digeterozigota ipak qurtining kapalaklari o’zaro chatishtirilganda 9:7 nisbatta sariq va oq pillali organizm hosil bo’ldi. Oq pillali qurtlarning genotipini toping.

1) AaBb; 2) Aabb; 3) aaBB; 4) aabb; 5) AaBB; 6 ) AABB; 7) aaBb; 8 ) AABb

A) 1, 5, 6, 8 B) 2, 3, 4, 7 C) 3, 4, 6, 8 D) 2, 5, 6, 7

9. Quyidagi hayvonlarga mos keluvchi urug’lanish tiplarini aniqlang.

a) gavial; b) drozofila; c) korsak; d) qizilto’sh

1) X xromosomali ♀ gameta + X xromosoma ♂ gameta = ♀; 2) Y xromosomali ♀ gameta + X xromosomali ♂ gameta =♀; 3) Y xromosomali ♀ gameta + X xromosomali ♂ gameta =♂; 4) X xromosomali ♀ gameta + Y xromosoma ♂ gameta =♀; 5) X xromosomali ♀ gameta + Y xromosoma ♂ gameta =♂; 6) X xromosomali ♀ gameta + X xromosoma ♂ gameta =♂

A) a, d-2, 4; b, c-3, 5 B) a, d-2, 6; b, c-1, 5

C) a, d-4, 6; b, c-1, 3 D) a, d-2, 4, 6; b, c-1, 3, 5

10. Digeterozigota qovoq o’simligi o’zaro chatishtirilganda 12:3:1 nisbatta oq, sariq va yashil qovoqlar hosil bo’ldi. Oq rangli qovoq genotipini toping.

1) AaBb; 2) Aabb; 3) aaBB; 4) aabb; 5) AaBB; 6) AABB; 7) aaBb; 8 )AABb

A) 1, 5, 6, 8 B) 2, 3, 4, 7 C) 3, 4, 6, 8 D) 2, 5, 6, 7

11. Modifikator (I) va letal (II) genga ega organizmlarni to‘g‘ri juftlangan javobni belgilang.

1) qoramollarda oq va qora yungning turli miqdorda irsiylanishi; 2) gomozigota sariq sichqonlarning o‘limi; 3) to‘q qizil rangni ta ’minlovchi pigmentga ega o‘simliklarda poya va shoxlarning qizil bo‘lishi

A) I-3; II -l B) I-2; II - l C) I-2; II-3 D) I-1; II-2

12. Quyidagi organizmlarni genlarning birikish guruhlari soni ortib borish tartibi to’g’ri keltirilgan javobni ko’rsating.

1) suvarak; 2) zog’ora baliq; 3) makkajo’xori; 4) drozofilla; 5) odam; 6) turp