Class 12 Biology Full Notes Package, Lecture notes of Biology

This package contains complete Class 12 Biology notes designed for easy understanding, quick revision, and effective board exam preparation. The notes are well-structured, concise, and exam-focused, making them ideal for students who want to revise the full syllabus in less time. All important concepts are explained in a simple and clear manner, suitable for both beginners and last-minute study.

Typology: Lecture notes

2024/2025

Available from 04/23/2026

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ay ee RY eee lo soe le 50 other 15 called os a heredity. | Vartatton CT ts the difference betwweer land qmongy rhe offspring of the _ D2 ts the branch of bfoloqy “whe —} 2 hereathy and variatfon. ts (alled os genetics - a ae word mds corned “by witiifan Bareson SE Greger Yohonn medel known as fa a Cla “Me studied tn physics, matrhemattas + — Se at conHipved his work os a prfes oid Ee aa lem i586, ‘he beqan nfs fammocts ceeite ae ——_—_ plant. ‘wid ra Me ih 1865, he presented | hits work fn._paper 7 en fn plank Hybrtdtzatfon’. my || Reason of Mendel strccess : = I Mende! selected a garden! pea plant (eesum. sa ae Thats eXperfone nt. i NRT, starked ts. experfmene by || ne_plants (homoxt yqds, a ere expert crenta | data,he kerk fo a. c A __lsustematfc and stattstical manner A—_—=_The experimental result. carefully yecordied sxe aires del cn a “garden pea plane a : - - a? Pisum - sot Mendel selecked a pan ped plank - aa . Garden pea plant {5 anaval:and corp } | 4 months | cycle Bit 3° — = a —f fa plank 15a naerally self pal hirnaring and ai 10 , —} pluenartart can also be ac hreved - and proe ce. ae | orfspreng- : = pe Es pea plany, mary varferfes cure €astlo oval LPiendel_selected only Ki pairs of traths (¢ “araceel po fea plant fs a smatt he rbtcvcus. plane and pedo pee many seeds! rt —_—_ Eira Flower’ fi larger po sfze and. bisexyal becarse OFM ia =p eoet size _arbifictal poliination can diso be achieved: + = Seve patrs of trefie ‘~ r | Character | eentnan F Recess tye en r Tatl(T) t }2-Flower postiton | Axtte(A) i 3 Flomer colowt = § —— Dwarf (¢) » & Termena|(a) _# >» Fs _ eS | i (Colour (Cc) Alhftre ( i = colour Yel toy Cy) srs i. ) Gr cE * tae Le Crreen (-) ae Ha i F i a Tn fla ted( 7) ") Co pre = ind ; —Kound (rR) | pear 3) S| Se a lirinkled(y) = a Pr dfagram we to use to shocw ans blag i] _ I ormmbi feitert roa partfcclar criss. OF plac breed fy | be a _sr= law of fnherftrance— | || Law of Dominance: (Mendel’s first law) ° Shitemente - lAthen 400 or more pafrs of contard ; | fairs are crossed fn ia generation + the charactey Fara _ sioes: nor a Cppear fs ioe LOCC 45 Pye: | whfch appears f5 corr always domrnant and | | a a YY RR. ss “gy san ; a | | / | Garmetes -.-.. YR ye rien 2 ‘ Sa [fg generatfon ....- Yy Ry [ Yellow Round. | 2 | Law of seqreqatfon [aw Of purthy oF gametes) # | | Crtende I's second jaw): aa | Stiement — wlhen one patr of contrasting traik fs ' crossed (Ai F, hybrid they renin aot Frou mixing —. Liontamtnattng ovr. altering at the +ime_of- qamete fowenaticrs Fhe get sepa ree This _lacw fs cerrtversely applicable. 6g: Plonohybrid Cross. |* Ponohybrtd cross [Monohybrid varte (3:1) = + | Plonohybrrd cho ss* A cross Pnvolved only | patr of \ contrasting Froft fs called as rmonehybrtd CIOS5. 4 | Plena brtd ratid : A_ratfo obbatned From the monohybrtd i ee fe. 3:! 85 alled gs monchybrid ratte. Jo | — | — = | Ey generatfon —-- - Aa {soale) | f generarton ----- Aa x Aa (selfing) | : ma i id | A - | A KA Ae Homozygous Heferozygus Ante | axfle : Ag qa Heterozygous Hornozyqus axile Feyrminal iz Phenotype - 2: | Axle Terminal | Gmorype? = IS 2 al ARO? BES Aetge Do, _ Hormozyq ous | Axtle Arile ter munof = e aan =~ we a ce ; Homozyqais Hetero z Yqouts elisa Parplecolecr purse caterer . aes Ce ME | Hebero 249 ous Homoz Yqous pulAe Colour GHIFE wIeUy 4Phenotr pe * 3: | = Purple @louy wihhtbe oloty ) tmoryoe < tC orton ; ; Homory qous Hettroedqay Hemoezqqous purple colouy POPE louy ote i z qt BF Gt oi a Paenotypetaite oo, yellaa, Green = roti — WH Roun ss Genotype AN Bs pate oo as oe = ex a oars Gyre io Trey a 3 ] © Phenotype Ts] | ©, 4am qu @ 4 ia) lk pea plant wit tall “Inf Jated d seed) ~ erossedk with | dwarf wit constricted “peg. plank. Which kind of 4 | avio obtained from “bhis. _ab Bove crossed + Ex latin bo et Atha 7 7. WAL. Tall Inflated (6 generatton --- -- Terr x __T#I¢ (selfing) ’ oe” mgs = _ a rf r1L i +L tf 1 ; | TT | || egyes ) .| TTL THEE | TeXt | TL | Tall Inflated Tall Inflated Tall Tnelated | Tal) Erelated .— I — | Ss a ee, TT ot Thr! | 7 | Tf | Tatl InAlated Tall conserick’ Tall Inflated | Tall constriet | J | a THIf ++I | Wit +L | Tall tnflateea- | Tall Inflated) Dwarf Inglated pwartexr _ Farad a fog teeh ffl Toft | wT aa CU SCFSC/Talt triflated Tal} corsiricke Dwart Inflated | Dwarf conser ne ae — ~_ =Rcked _ | a tae +h | Tall Dwarf | | | | Phenotype ratfo= 1° | # \Jesh cross + Clalhert F, hybrid cross onli with their recesstve perenne | fs called as a fesb cross. The ratio ebtatnrd from this cross te. 1:1) ps called A | Fest ratio. | ir Ege: | Porenks ——> Heterozygous Homozygous Tatl Dwart Grenory pe— Te a +¥ 4 Gamates — 7 + F aaa — | a T+ (Tall) et(Dwart) | { | . + T+ (tal!) ++ (pwart ) Phenotype raho = I'1 “ _—— ndelran_genetics (Neo mendeltsm) + edtscovery of the mendel_experfonent ,agg ntfisks perform rhe _expertonent_on the Att ter _— plants and anfmals- and they observe differenee *uhich are_dtfferent from mendel’s F i Teg are called a5 post medeélian gencrics or@ mrnae n._ [Types of Gene toteractfons: / SCS) Se cd : i Intragenersc Mteraction Intergenf En SV a op ———tithe tateroctton occtrr bet” | 4. The Interaction € roberaction. pe ae ne of the sane qene Alles of the ares rinses Treen 7 presents o1 tne sarne ar chromo oes 2 fg: Incomplete dormtaance | 9. €4: bier. —ptnd_te=demtnance. .— mp €ptsbasts +4 Lanny A irae ¢: pur to carrle.— ; Wa ea dics, Red Co e fal Be taric colour Ca: & (renottype - ~~ - RR . | | | | qametes =. R ait BS it | 3 r% fi generatton - --- RIA (Roan) | se ; -& generarfon -._.. RIAL Xx RA _(Rean) Coan) W sega Bie Goan) | W (Roan) eS taney t } : Pech ldo dom nance anda fncemp e domrnance. Leg: ABO. blood. qroup syste m_fn_human_pefng.— ” n_betng gene 1 contro e ABO blooe Ti. ee wy io 5 ; Seam Aictes : I*, 1° oid Fg: . ts a) ae ' i — T 7 - 1 (v) Genoryp ¢ | ___Pheriofupe we i Toor ‘le | om OE Ta a . Bb p14 of AB ff 1 0 : ae ae \ Bs a a Hil a | : ____._ ae oe) witngs of Drosophtla+ ee me * Phenotype | _GeNory pe — ae | + et Normal wrng > | i Ae Le ; V 4 ee Niicked wings } vg F i | Oo Li Noth wfngs — a st — q te Sutton ce ole pur form ee teddy ai Fheory stated thak Game te (speron £ oval carry ol! Fhe Hered tkary cha and connecting link be¢ joa rents and _oFfsjor ng: : [b. Nucleos of the game +e aneee chromosome ctohich hereditary characters. 83: Chromosomes are found fn the parrs fn_sematte Lor atpioid: cell . 4D gamete formatton., the hemoeleqous chromaome | | gek Separdicd during meosté and gamete contatn hap! ord Ox half numbes chropnp anne & During fertilization , the unron of sperm and 44 restore dfplord condition rn zyqo ke. ¥| Chromosome: Chromosome are Filamentus body presen’ fn the | rauclevs - T Tew are only visible durtng cell drviator. BE tine chromosome word was cofned by lal: Waldyer. pe The number of chromosome _ MOYLES Prom spectes iz) spectes: oe Ne Bie rz of the chromosome vartes fror ches a ko Species. Tr ranges from O-] Fo 3 Waar. feb ——__{imetaphase) and. 0: 2 1 2 met bee rH eke fhe shape of the chromosome _ in the atte rent | ae Vartes according 4 4 + “nurnbe.Y « + St So oo ims \ , oe a wae Anetuplot ry ’ | TE fs nok exackH t a exactly multiply with ; ak pita base number w primary bast plofidy Diplordy , _ Pupletad ~ Hupoplofd L (n) ‘(2n) (an Hn, oat. ‘— ae Triso gi 4 aunt ap Monosomny Nol! fsomy : | (2S) (n= bE al Chromoserme || * iy) as = at Steuctetre : 7 ; :