Bab 6 : Pembahagian Sel ( 2 )

Question 1

1. Profasa ( mitosis )

Answer 1

1. Kromatid memendek & menebal
2. Kromosom became kromatid kembar & terikat to sentromer
3. Membran nukleas terurai
4. Nukleolus menghilang
5. Sentriol gone to kutub bertentangan & membentuk gentian gelendong

Question 2

2. Metafasa ( mitosis )

Answer 2

1. Gentian gelendong menetapkan sentromer at 1 lined sudut khatulistiwa
2. Ended when sentromer terbahagi

Question 3

3. Anafasa ( mitosis )

Answer 3

1. Sentromer terbahagi, kromatid kembar terbahagi
2. Gentian gelendong mengecut
3. Kromatid kembar tertarik to kutub bertentangan
4. Ended when kromatid kembar arrived at kutub bertentangan

Question 4

4. Telofasa ( mitosis )

Answer 4

1. Now, kromatid known as kromosom anak
2. Setiap kutub sel have 1 set kromosom lengkap & seiras
3. Kromosom become bebenang halus kromatid back
4. Nukleolus & membran nukleas formed back
5. Gentian gelendong gone
6. Then followed by sitokinesis

Question 5

Meiosis

Answer 5

Proses pembahagian sel berlaku organ pembiakan for menghasilkan gamet ý mempunyai bil kromosom half ( haploid ) from bil kromosom sel induknya ( diploid )

Question 6

Keperluan mitosis

Answer 6

○ memastikan pertambahan sel ý pesat berlaku
○ menggantikan sel² ý mati / rosak
○ menghasilkan individu baharu
○ menghasilkan organ baharu
○ menggunakan teknik pengkulturan

Question 7

Keperluan meiosis

Answer 7

○ memastikan bil kromosom diploid kekal dr generation to generation
○ menghasilkan variasi genetik with same spesies

Question 8

1. Profasa 1 ( meiosis )

Answer 8

1. Kromatid memendek, menebal & became kromosom
2. Kromosom homolog berpasangan ( sinapsis ) formed 4 kromatid for kromosom homolog ( bivalen / tetrad )
3. Proses pindah silang are pertukran bahan genetik kromosom² X seiras

Question 9

2. Metafasa 1 ( meiosis )

Answer 9

1. 1 kromosom from kromosom homolog terikat at gentian gelendong from 1 kutub sel & homolognya terikat at gentian gelendong from kutub bertentangan
2. Kromatid kembar still terikat to sentromer

Question 10

3. Anafasa 1 ( meiosis )

Answer 10

1. Gentian gelendong mengecut after pull kromosom homolog till berpisah to arah bertentangan
2. All kromosom still have sentromer

Question 11

4. Telofasa 1 ( meiosis )

Answer 11

1. Kromosom at bertentangan kutub are haploid
2. Gentian gelendong gone
3. Nukleolus & membran nuklead terbentuk

Question 12

5. Profasa 2 ( meiosis)

Answer 12

1. Nukleolus & membran nukleas gone
2. Kromosom known as kromatid kembar bercamtum ngan sentromer
3. Gentian gelendong terbentuk

Question 13

6. Metafasa ll ( meiosis )

Answer 13

1. Kromosom lined at satah khaltulistiwa
2. All kromatid bonded with sentromer by gentian gelendong
3. Ended when sentromer berpisah