genetic crosses w the monohybrid cross w the dihybrid cross

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