Snheritarce and Vatiat iohs
CH -5 - Princip Jes of
illia
W Bateson (906).
Term Gehe tics was firs discovered by
i-e. trons miss ioh of body
of heridity es) from paenbs
Genetic s - St is he study and diffe renc
feabures .(both similorities to such trans mission.
relating
Boffsprin and be laws
geneti cally based cha ratterisEicá
f
Herediky 9t is the tronstnisS ioh
from parents ko offsping
individuals of
amoh Hhe
Vatiationss - The small differences
he same species
Mendal (1822 -84 the father of
is Knowh as (Pisum
Johann sativum)
geneties
He expe rimented on a garden pea
For tyars (1853 -62)
3:1
tatio
* Law otDorminance explainks the phenoty pk ratio' - 1:2: 1
Gehotbapic
Law of Segragatien explains Ehe
Inheritah ce of_ One Gene
two indi
Monohbrid Cross SE is a process mating bet ween
- vid vals with dominant aenotypeshomo Z 4QuS
gero bypes or alleles with here ditaty charactar sbcs
St also resolts in pheho type
Dwatf
X (EE) aametes. TE X (TE)
8)
(ANTall)
Fa -Gen. F2-Gn.
, *
Ghenokype The set of genes present in the cells of an
t Phenotype The obser vable charac beris tics which e
genetically controlled.
Law f Domin ance In a dissimilof pat of Allele one
member of he pair dominates the other
(reeesive JE is Kh own as Law of Dominahe
Note+ Recessjve fa ctor (Allele) can express itself only in homo8gous
condjion (when both ate recessive).
) Law of Segregakion st states hat bwo alleles f a tit
character remain in be for mof a poir: Duting the
gamele toFration Bhey get segregata
No beblendin can be observed durin hetero 8gous
cohditi bh
Homozy9005 Dund seed
plant
92) RR) cross pllinaton
Rr Rr
-genaraion
Hee ro zgous round
R
3round due bo its dorminne
R RR Rt 1 -wrinKed.
rRr
3:1
genr rahon~ St po lina Eion
, Di-hybrid Cross
* Chaacters :
9 Shape of seed (KKYY
a) colouF of Seed . RY) (RY
’ Yellow gteen:
GLenoty pic rakio - 4:2:1
1 :2: 1) x (1:2 :1
1 :2:1 : 2 : 4: 2 : 1 : 2 :1
RrYy) Al ate tound and Yello w
F genetaion
Round d yellow
Roundgreen =3
wrinkled yellow 3
wrinkleddpreen 1
Phesnotupic tatio 9:3:3 :1.
RR Y Y
RRY RX YY
Rr Y
RrYy
r8
CH -5 - Princip Jes of
illia
W Bateson (906).
Term Gehe tics was firs discovered by
i-e. trons miss ioh of body
of heridity es) from paenbs
Genetic s - St is he study and diffe renc
feabures .(both similorities to such trans mission.
relating
Boffsprin and be laws
geneti cally based cha ratterisEicá
f
Herediky 9t is the tronstnisS ioh
from parents ko offsping
individuals of
amoh Hhe
Vatiationss - The small differences
he same species
Mendal (1822 -84 the father of
is Knowh as (Pisum
Johann sativum)
geneties
He expe rimented on a garden pea
For tyars (1853 -62)
3:1
tatio
* Law otDorminance explainks the phenoty pk ratio' - 1:2: 1
Gehotbapic
Law of Segragatien explains Ehe
Inheritah ce of_ One Gene
two indi
Monohbrid Cross SE is a process mating bet ween
- vid vals with dominant aenotypeshomo Z 4QuS
gero bypes or alleles with here ditaty charactar sbcs
St also resolts in pheho type
Dwatf
X (EE) aametes. TE X (TE)
8)
(ANTall)
Fa -Gen. F2-Gn.
, *
Ghenokype The set of genes present in the cells of an
t Phenotype The obser vable charac beris tics which e
genetically controlled.
Law f Domin ance In a dissimilof pat of Allele one
member of he pair dominates the other
(reeesive JE is Kh own as Law of Dominahe
Note+ Recessjve fa ctor (Allele) can express itself only in homo8gous
condjion (when both ate recessive).
) Law of Segregakion st states hat bwo alleles f a tit
character remain in be for mof a poir: Duting the
gamele toFration Bhey get segregata
No beblendin can be observed durin hetero 8gous
cohditi bh
Homozy9005 Dund seed
plant
92) RR) cross pllinaton
Rr Rr
-genaraion
Hee ro zgous round
R
3round due bo its dorminne
R RR Rt 1 -wrinKed.
rRr
3:1
genr rahon~ St po lina Eion
, Di-hybrid Cross
* Chaacters :
9 Shape of seed (KKYY
a) colouF of Seed . RY) (RY
’ Yellow gteen:
GLenoty pic rakio - 4:2:1
1 :2: 1) x (1:2 :1
1 :2:1 : 2 : 4: 2 : 1 : 2 :1
RrYy) Al ate tound and Yello w
F genetaion
Round d yellow
Roundgreen =3
wrinkled yellow 3
wrinkleddpreen 1
Phesnotupic tatio 9:3:3 :1.
RR Y Y
RRY RX YY
Rr Y
RrYy
r8
