Download - 3.3 Penentuan Seks Anak
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3.3 PENENTUAN SEKS ANAK DAN KEJADIAN KEMBAR
PADA MANUSIA
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Setiap sel pada badan manusia mempunyai 46 kromosom / 23 pasang
Setiap sel pada badan manusia mempunyai 46 kromosom / 23 pasang
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SEX AUTOSOMES SEX CHROMOSOMES
SOMATIC CELL
Male 44 / 22 pairs XY 44 + XY
Female 44 / 22 pairs XX 44 + XX
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PEMBENTUKAN KEMBAR
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Jenis – jenis KembarJenis – jenis Kembar
Kembar seirasKembar seiras Kembar tak seirasKembar tak seiras
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Kembar Seiras
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KEMBAR SEIRASKEMBAR SEIRAS
Terjadi apabila satu ovum disenyawakan oleh satu sperma dan
menghasilkan satu zigot
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KEMBAR SEIRASKEMBAR SEIRAS
Mempunyai kandungan genetik yang sama
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KEMBAR SEIRASKEMBAR SEIRAS
Berkongsi satu plasenta yang sama
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KEMBAR SEIRASKEMBAR SEIRAS
Mempunyai jantina yang sama, iaitu kedua-duanya perempuan atau lelaki
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KEMBAR TAK SEIRAS
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KEMBAR TAK SEIRASKEMBAR TAK SEIRAS
Terjadi apabila dua ovum disenyawakan serentak oleh dua
sperma
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KEMBAR TAK SEIRASKEMBAR TAK SEIRAS
Mempunyai kandungan genetik yg berbeza
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KEMBAR TAK SEIRASKEMBAR TAK SEIRAS
Setiap bayi mempunyai plasenta masing-masing
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KEMBAR TAK SEIRASKEMBAR TAK SEIRAS
Kembar ini mungkin mempunyai jantina yang sama atau berbeza