dihybrid punnett squares worksheet: two-factor crosses · dihybrid punnett squares worksheet:...

Name: ___________________________________________________ Class: ______ Date: _________ Dihybrid Punnett Squares Worksheet: Two-factor crosses In pea plants, green pod color is dominant over yellow pod color. Tall plant height is dominant over short plant height. Ex) A tall green pea plant (homozygous for both traits) is crossed with a short yellow pea plant. TT or Tt = tall tt = short GG or Gg = green gg = yellow P Generation genotypes: TTGG x ttgg Possible gametes: TG x tg TG TG TG TG tg tg tg tg Phenotypic Ratio: 16 tall/green : 0 tall/yellow : 0 short/green : 0 short/ yellow Genotypic Ratio: All TtGg 1) A tall green pea plant (homozygous for height, heterozygous for pod color) is crossed with a tall green pea plant (heterozygous for both traits). P Generation genotypes: __TTGg _________ x _____TtGg ________ Possible gametes: ___TG, Tg _____________ x_____TG, Tg, tG, tg___________ Genotypic Ratio: ________________________________________ Phenotypic Ratio: ___ tall/green : ___ tall/yellow : ___ short/green : ___ short/ yellow Genotypic Ratio: ___________________________________________ Phenotypic Ratio: ____ tall/green : __ __ tall/yellow : ___ _ short/green : __ __ short/ yellow TtGg TtGg TtGg TtGg TtGg TtGg TtGg TtGg TtGg TtGg TtGg TtGg TtGg TtGg TtGg TtGg TG TG Tg Tg TG TTGG TTGG TTGg TTGg Tg TTGg TTGg TTgg TTgg tG TtGG TtGG TtGg TtGg tg TtGg TtGg Ttgg Ttgg TG Tg TG TTGG TTGg Tg TTGg TTgg tG TtGG TtGg tg TtGg Ttgg

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Name: ___________________________________________________ Class: ______ Date: _________

Dihybrid Punnett Squares Worksheet: Two-factor crosses

In pea plants, green pod color is dominant over yellow pod color. Tall plant height is dominant over

short plant height.

Ex) A tall green pea plant (homozygous for both traits) is crossed with a short yellow pea plant.

TT or Tt = tall tt = short GG or Gg = green gg = yellow

P Generation genotypes: TTGG x ttgg

Possible gametes: TG x tg

TG TG TG TG

Phenotypic Ratio: 16 tall/green : 0 tall/yellow : 0 short/green : 0 short/ yellow

Genotypic Ratio: All TtGg

1) A tall green pea plant (homozygous for height, heterozygous for pod color) is crossed with a tall green pea

plant (heterozygous for both traits).

P Generation genotypes: __TTGg_________ x _____TtGg________

Possible gametes: ___TG, Tg_____________ x_____TG, Tg, tG, tg___________

Genotypic Ratio: ________________________________________

Phenotypic Ratio: ___ tall/green : ___ tall/yellow : ___ short/green

: ___ short/ yellow

Genotypic Ratio: ___________________________________________

Phenotypic Ratio: ____ tall/green : ____ tall/yellow : ____ short/green : ____

short/ yellow

TtGg TtGg TtGg TtGg

TG TG Tg Tg

TG TTGG TTGG TTGg TTGg

Tg TTGg TTGg TTgg TTgg

tG TtGG TtGG TtGg TtGg

tg TtGg TtGg Ttgg Ttgg

TG Tg

TG TTGG TTGg

Tg TTGg TTgg

tG TtGG TtGg

tg TtGg Ttgg

Page 2: Dihybrid Punnett Squares Worksheet: Two-factor crosses · Dihybrid Punnett Squares Worksheet: Two-factor crosses ... Dihybrid cross worksheet Name_____ Author: christopher tekely

2) Two tall green pea plants are crossed. One plant is heterozygous for height and homozygous for pod color,

while the other is homozygous for height and heterozygous for pod color.

P Generation genotypes: ____TtGG______ x _____ TTGg ______

Possible gametes: ____ _____________ x___ ______________

Genotypic Ratio: _________________________________

Phenotypic Ratio: ______ tall/green : ____ tall/yellow :

____ short/green : ____ short/ yellow

Genotypic Ratio:__________________________________________

Phenotypic Ratio: _____ tall/green : ____ tall/yellow : ____ short/green :

____ short/ yellow

3) Two tall, green pea plants (heterozygous for both traits) are crossed.

P Generation genotypes: ___TtGg_______ x ___TtGg_______

Possible gametes: __________ _____ x______________ _____

Phenotypic ratio: _____ tall/green : _____ tall/yellow : _____ short/green : _____ short/ yellow

Genotypic ratio: ___________________________________________________________ ____

TG TG tG tG

TG TTGG TTGG TtGG TtGG

Tg TTGg TTGg TtGg TtGg

TG tG

TG TTGG TtGG

Tg TTGg TtGg

TG Tg tG tg

TG TTGG TTGg TtGG TtGg

Tg TTGg TTgg TtGg Ttgg

tG TtGG TtGg ttGG ttGg

tg TtGg Ttgg ttGg ttgg

Page 3: Dihybrid Punnett Squares Worksheet: Two-factor crosses · Dihybrid Punnett Squares Worksheet: Two-factor crosses ... Dihybrid cross worksheet Name_____ Author: christopher tekely

4) Red flower color is dominant over white flower color. Tall plant height is dominant over short height. A

tall red flowered plant (heterozygous for both traits) is crossed with a short white flowered plant.

P Generation genotypes: ___TtRr_______ x ____ttrr_______

Possible gametes: ___________ ________ x_______________________

Genotypic Ratio: __________________________________ ___________________________

Phenotypic Ratio: ____ tall/red : ____tall/white : ____ short/red : ____ short/white

tr tr tr tr

TR TtRr TtRr TtRr TtRr

Tr Ttrr Ttrr Ttrr Ttrr

tR ttRr ttRr ttRr ttRr

tr ttrr ttrr ttrr ttrr

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