bab 5.pptx
TRANSCRIPT
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BAB 5: PEMBAHAGIAN SEL
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5.1 MITOSIS
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Kitar Sel
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1. Profasa2. Metafasa3. Anafasa4. Telofasa
FASA MITOSIS
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Kultur tisu
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MEIOSIS
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MEIOSIS
• Pembahagian sel untuk menghasilkan sel gamet.
• Gamet jantan = sperma, gamet betina = ovum.• Anak yang dilahirkan akan mewarisi ciri dan
sifat kedua ibu bapanya kerana separuh bahan genetik di dalam anak berasal daripada ibu dan separuh lagi berasal daripada bapa
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Fasa meiosis
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Kromosom homolog
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PROFASA I I. Kromosom menebal &
memendek membentuk kromatid
II. Kromosom homolog bersinapsis & membentuk bivalen/tetrad
III. Pindah silang berlakuIV. Membran nukleus &
nukleolus hilangV. Sentrol membahagi &
gentian gelendong terbentuk
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METAFASA IKromosom homolog
menyusun di satah khatulistiwa
ANAFASA 1-Gentian Gelendong mengecut &
menarik kromosom ke kutub bertentangan. Kromosom homolog
terpisah
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TELOFASA 1 & SITOKINESIS:• Dua sel anak yang gaploid
terbentuk
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MEIOSIS II: Setiap sel haploid membahagi untuk membentuk empat sel anak yang dinamakan
gametPROFASA II:• Sinapsis dan pindah silang
tidak berlaku
METAFAS II:• Pasangan kromatid tersusun
di satah khatulistiwa
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ANAFASA II:• Gentian gelendong mengecut
dan menarik kromatid ke kutub bertentangan
TELOFASA II:• Empat sel anak yang
haploid terbentuk
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