genetic crosses w the monohybrid cross w the dihybrid cross
TRANSCRIPT
GENETIC GENETIC CROSSESCROSSES
THE MONOHYBRID THE MONOHYBRID CROSSCROSS
THE DIHYBRID CROSSTHE DIHYBRID CROSS
First: Set up the First: Set up the Parental Cross P 1Parental Cross P 1
A = axial flowersA = axial flowers MaleMale a = terminal flowers a = terminal flowers
FemaleFemale AA X aaAA X aa
SET UP THE PUNNETT SET UP THE PUNNETT SQUARESQUARE
Male Trait Male Trait
Female Trait
Female Trait
Put the Alleles in Separate Put the Alleles in Separate BoxesBoxes
A A
a
a
A Monohybrid CrossA Monohybrid Cross
A A
a Aa Aa
a Aa Aa
Now Perform an FNow Perform an F1 1 CrossCross
A = axial flowersA = axial flowers MaleMale a = terminal flowers a = terminal flowers
FemaleFemaleFF1 = 1 = First OffspringFirst Offspring Aa X AaAa X Aa
Put the Alleles in Separate Put the Alleles in Separate BoxesBoxes
A a
A
a
Perform the CrossPerform the Cross
A a
A A A A a
a A a a a
Assess The Genotype and Assess The Genotype and PhenotypesPhenotypes
GENOTYPESGENOTYPESAA 1AA 1Aa 2 Aa 2 aa 1aa 1Ratio 1:2:1Ratio 1:2:1
PHENOTYPESPHENOTYPESAxial Flowers Axial Flowers
(AA, Aa) 3(AA, Aa) 3Terminal Terminal
Flowers (aa) 1Flowers (aa) 1Ratio 3:1Ratio 3:1
Assess The Genotype and Assess The Genotype and PhenotypesPhenotypes
PHENOTYPESPHENOTYPESAxial Flowers Axial Flowers
33Terminal Terminal
Flowers 1Flowers 1Ratio 3:1Ratio 3:1
GENOTYPESGENOTYPESAA 1AA 1Aa 2 Aa 2 aa 1aa 1Ratio 1:2:1Ratio 1:2:1
First: Set up the First: Set up the Parental Cross P 1Parental Cross P 1
. . F =flying f = walking P = purple p = orange FFPP X ffpp MALE FEMALE
PARENTAL PPARENTAL P11
DIHYBRID CROSSDIHYBRID CROSS
F P F P F P F P
f p
f p
f p
f p
PARENTAL PPARENTAL P11
DIHYBRID CROSSDIHYBRID CROSS
F P F P F P F P
f p FfPp FfPp FfPp FfPp
f p FfPp FfPp FfPp FfPp
f p FfPp FfPp FfPp FfPp
f p FfPp FfPp FfPp FfPp
. . F =flyingf = walking P = purple p = orange Do the F1 cross FfPp X FfPp Be sure you choose one of
EACH type of allele
FF22
DIHYBRID CROSSDIHYBRID CROSS
F P F p f P fp
FP
Fp
f P
f p
FF22
DIHYBRID CROSSDIHYBRID CROSS
F P f P F p f p
FP FFPP FfPP FFPp FfPp
Fp FFPp FfPp FFpp Ffpp
f P FfPP ffPP FfPp ffPp
f p FfPp ffPp Ffpp ffpp
FF22
DIHYBRID CROSSDIHYBRID CROSS
F P f P F p f p
FP FFPP FfPP FFPp FfPp
Fp FFPp FfPp FFpp Ffpp
f P FfPP ffPP FfPp ffPp
f p FfPp ffPp Ffpp ffpp
FF22
DIHYBRID CROSSDIHYBRID CROSS
F P f P F p f p
FP FFPP FfPP FFPp FfPp
Fp FFPp FfPp FFpp Ffpp
f P FfPP ffPP FfPp ffPp
f p FfPp ffPp Ffpp ffpp
FF22
DIHYBRID CROSSDIHYBRID CROSS
F P f P F p f p
FP FFPP FfPP FFPp FfPp
Fp FFPp FfPp FFpp Ffpp
f P FfPP ffPP FfPp ffPp
f p FfPp ffPp Ffpp ffpp
FF22
DIHYBRID CROSSDIHYBRID CROSS
F P f P F p f p
FP FFPP FfPP FFPp FfPp
Fp FFPp FfPp FFpp Ffpp
f P FfPP ffPP FfPp ffPp
f p FfPp ffPp Ffpp ffpp
FF22
DIHYBRID CROSSDIHYBRID CROSS
F P f P F p f p FP FFPP FfPP FFPp FfPp 9 Fp FFPp FfPp FFpp Ffpp 3 f P FfPP ffPP FfPp ffPp 3 f p FfPp ffPp Ffpp ffpp 1