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Commonly confused
Homozygous vs heterozygous
Baat ek hi cheez par aati hai: gene ki do copies same hain, ya alag?
Homozygous
Dono copies same: TT (homozygous dominant) ya tt (homozygous recessive). Homozygous organism us trait ke liye true breed karta hai.
Heterozygous
Do copies alag: Tt. Ek dominant, ek recessive. Dominant dikhta hai. Recessive chhupa rehta hai, par phir bhi aage pass ho sakta hai.
Trap yeh hai
Students inhe dekh kar pehchaanne ki koshish karte hain, par TT aur Tt dono tall hote hain, bilkul same. Dominant trait ke liye tum dekh kar homozygous aur heterozygous me farak nahi bata sakte. Sirf tt khud ko dikhata hai, kyunki recessive trait aakhir me dikh jaata hai.
Ek quick check
Tt genotype wala organism hai:
- AHomozygous dominant
- BHomozygous recessive
- CHeterozygous
- DPure-breeding