Ek Purana Sawaal 🤔
Ek pehalwaan zindagi bhar mehnat karke bahut mazboot muscles banata hai. Kya uska beta paida hote hi thoda zyada mazboot hoga? Ek aadmi zindagi bhar mehnat se angrezi seekhta hai — kya uska bachcha thodi angrezi jaanta hua paida hoga?
Aaj hum sab jaante hain ki jawab nahi hai. Par 200 saal pehle duniya ke sabse bade vaigyanikon mein se ek ne kaha tha ki jawab haan hai — aur unki us galti se hume genetics ka sabse zaroori sabak mila.
📌 Trait (lakshan) do tarah ke hote hain:
🔹 Inherited (anuvanshik) — jo gene se aate hain, maa-baap se
mile hue
🔹 Acquired (arjit) — jo zindagi mein kamaye jaate hain, gene
mein nahi hote
⚖️ Dono Mein Farak
📌 Ek line ka niyam:
Aapke shareer ki body cells (muscle, khaal, dimaag) mein hua koi bhi badlav
bachchon tak nahi jaata — kyunki bachche sirf
germ cells (sperm/ovum) se bante hain. Jab tak badlav
germ cell ke DNA mein na ho, wo agli peedhi tak pahunch hi nahi sakta.
🦒 Lamarck Ki Mashhoor Galti
Jean-Baptiste Lamarck (1744–1829) ek bade french vaigyanik the. Unhone sabse pehle ye kaha ki jeev samay ke saath badalte hain — ye soch us zamaane mein bahut bahaduri wali thi. Par unka tareeka galat tha.
Lamarck ka jawab: "Bahut saal pehle zirafon ki gardan chhoti thi. Unhe unche
pedon ke patte khaane ke liye gardan kheenchni padi. Kheench-kheench kar gardan
thodi lambi ho gayi. Phir unhone wo lambi gardan apne bachchon ko de di. Aisa
peedhi-dar-peedhi hua aur gardan lambi hoti chali gayi."
Ise "Inheritance of Acquired Characters" kehte hain.
Galti kahan hai? Kheenchne se gardan ki body cells par asar pada,
par zirafe ke germ cells (sperm/ovum) ke DNA mein koi badlav nahi hua. Toh wo
"kamayi hui" lambai bachche tak pahunch hi nahi sakti thi.
Sahi jawab (Darwin ka): zirafon ki aabaadi mein pehle se hi thodi
variation (vividhata) thi — kuch ki gardan zara lambi, kuch ki zara chhoti. Jinki gardan lambi
thi wo unche patte kha paaye, behtar zinda rahe aur zyada bachche kar paaye. Peedhi-dar-peedhi lambi
gardan wale gene badhte gaye. Gardan kisi ne "kamayi" nahi — jinke paas pehle se
thi, wo bach gaye.
1880 ke dashak mein August Weismann ne Lamarck ki soch ko seedha test kiya. Unhone
chuhon ki poonch kaat di aur unse bachche paida karwaye. Phir un bachchon ki poonch kaat kar unse
bhi bachche karwaye. Aisa unhone 21 peedhiyon tak kiya —
1592 chuhon par.
Nateeja? 22vi peedhi ka chuha bhi poori lambi poonch ke saath hi
paida hua. Ek bhi bachcha chhoti poonch ke saath nahi aaya.
Yahi seedha sabak hai: shareer par kiya gaya badlav DNA nahi badalta. Isiliye
peedhi-dar-peedhi kaan chhedne se koi bachcha chhide hue kaan ke saath paida nahi hota.
🧪 Khud Test Karo — 3 Sawaal
Kisi bhi trait ke baare mein ye teen sawaal poochho, jawab mil jaayega:
1. Kya ye paida hote waqt tay ho gaya tha, ya baad mein aaya?
2. Kya iske liye koi gene zimmedaar hai?
3. Kya iska badlav germ cell ke DNA tak pahuncha?
Teeno ka jawab "haan" = inherited. Koi bhi "nahi" = acquired.
| Trait | Kaunsa? | Kyun |
|---|---|---|
| Aankhon ka rang | Inherited | Gene se tay, paida hote waqt hi fix |
| Body-builder ke muscles | Acquired | Mehnat se banaye — sirf muscle cells badle |
| Hindi bolna | Acquired | Seekha gaya — gene mein bhasha nahi hoti |
| Khoon ka group | Inherited | Gene se tay, kabhi badalta nahi |
| Cycle chalana | Acquired | Abhyaas se seekha hunar |
| Thalassaemia | Inherited | Recessive gene se, dono parents se milta hai |
| Dhoop se kaali padi khaal | Acquired | Sirf khaal ki cells badlin, DNA nahi |
| Jeebh mod paana | Inherited | Dominant gene se tay |
⚠️ Ek nazuk baat — kad (height): Kad ka gene toh inherited hai, par asli kad
khaana bhi tay karta hai. Agar bachpan mein nutrition (poshan) na mile toh koi bachcha apni
poori genetic lambai tak nahi pahunchta.
Isliye kai trait "gene + maahol" dono ka nateeja hote hain — sirf ek nahi. Isko
"nature aur nurture" kaha jaata hai.
🌱 Toh Naye Trait Aate Kahan Se Hain?
Agar acquired trait aage nahi jaate, toh jeevon mein naye trait aaye kaise? Jawab hai: mutation.
📌 Mutation = DNA mein hui ek achanak galti (jaise copy karte waqt
ek akshar badal jaana).
🔹 Agar mutation body cell mein ho → sirf usi vyakti par asar, aage nahi jaata
🔹 Agar mutation germ cell mein ho → bachchon tak jaata hai
Zyadatar mutation ka koi asar nahi hota, kuch nuksaandeh hote hain, aur kabhi-kabhi ek
faayde ka nikal aata hai — aur wahi evolution ka kachcha maal ban jaata hai.
🩺 Sickle cell — ek hi galti, do nateeje. Sickle cell anaemia
ek hi base ki galti se hota hai. Jinke paas dono kharab allele
hon, unhe gambhir bimari hoti hai. Par jinke paas sirf ek ho (carrier), unhe bimari
toh nahi hoti — aur unhe malaria se kuch bachaav bhi mil jaata hai!
Isiliye bharat ke un ilaakon mein jahan malaria zyada raha hai (jaise madhya bharat ke kai aadivasi
ilaake), wahan sickle cell allele zyada paaya jaata hai. Bharat sarkaar ne
2023 mein "National Sickle Cell Anaemia Elimination Mission" shuru kiya hai, jiska
lakshya un ilaakon mein ghar-ghar jaanch karna hai. Jaanch karwana samajhdari hai —
isse pata chal jaata hai ki aap carrier hain ya nahi.
Bharat mein aksar kaha jaata hai ki "padhe-likhe maa-baap ke bachche tez hote hain". Ismein
gene ka hissa bahut kam hai — asli wajah hai ki aise gharon mein bachchon ko
kitaabein, achhi padhai aur samay milta hai.
Yahi is lesson ka sabse sundar sandesh hai: padhai inherited nahi hai. Koi bhi
bachcha, kisi bhi gaon ya parivaar se, agar use mauka aur achhi shiksha mile, toh sabse aage ja
sakta hai. Dr. A. P. J. Abdul Kalam ek nav (boat) banane wale ke bete the
Rameswaram ke ek chhote se ghar se — aur desh ke rashtrapati aur mahaan vaigyanik bane.
Gene aapka rang aur kad tay karte hain. Aapki mehnat aur mauka
aapka bhavishya tay karte hain.
🧠 Apne Aap Ko Test Karo
🌳 Pedigree Explorer mein dekho ki koi trait peedhi-dar-peedhi kaise safar karta hai!
Open Trait Explorer →