Cell Cycle and Cell Division
Mitosis
Mitosis matlab ek cell ka do identical cells me divide hona. Har nayi cell ko chromosomes ki poori, exact copy milti hai, isliye ye growth aur repair ke liye use hota hai.
DNA copy hone ke baad, mitosis use baant deta hai. Copied chromosomes beech me line up karte hain, phir har ek ki do copies opposite ends par kheench li jaati hain. Phir cell do me split ho jaati hai.
Dono daughter cells me parent jitne hi chromosomes hote hain (diploid diploid hi rehta hai) aur wahi genes. Isliye mitosis clones banata hai: nayi skin, naya blood, bhare hue zakhm.
Yahaan students galti karte hain
Mitosis chromosome number same rakhta hai, aadha nahi karta. Do daughter cells, har ek parent jaisi. Students aksar isko meiosis se confuse karte hain, jo number aadha karta hai aur chaar cells banata hai. Mitosis: same number, do cells, identical.
Yaad rakho
Ek cell, do identical copies, same chromosome number.
Exam me kaise kaam aata hai: phase order (prophase se telophase) aur 'same number, identical cells' tested points hain.
Ye kahaan jud'ta hai
Mitosis growth ke liye identical cells banata hai; doosra division, meiosis, jaan-boojh kar shuffle aur aadha karke gametes banata hai. Same machinery, ulte goals, isiliye ye dono mix karna itna aasaan hai.
Mitosis vs meiosis →Ek quick check
46 chromosomes wali ek human cell mitosis se divide hoti hai. Har daughter cell me hote hain:
- A23 chromosomes
- B46 chromosomes
- C92 chromosomes
- DAlag-alag hota hai