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Page 1: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,
Page 2: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Create a gene and a corresponding allele on your whiteboardGene: _____________Allele: ________, _________

Alleles (variations of trait)-Purple, blue, white-curly, straight, wavy-Short, tall

Gene (trait)-Flower Color-Hair type-Plant Height

Page 3: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Phenotype Physical appearance terms ex. Tall, short, brown hair etc.

Genotype Genes in cell, written with letters that

represent the genes (ex: “T” for tall, or “t” for short)

Page 4: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

• Punnett Squares: diagram that determines the probable distribution of inherited traits in the offspring.

• UPPERCASE letters are used to represent dominant genes (traits).

• lowercase letters are used to represent recessive genes (traits).

Page 5: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Homozygous: Both alleles are the same. Either both capitols (dominant) or both lower-cased (recessive)Example:

•BB (homozygous dominant) •bb (homozygous recessive)

Heterozygous: Both alleles are different. One capital letter and one lower-cased letter. Example:Bb

Page 6: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,
Page 7: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

1. RR=

2. Ll=

3. Yy

4. Ee

Page 8: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

1. A fish is homozygous recessive for fin color

2. A cat is heterozygous for tail length.

3. A turtle is homozygous dominant for shell color.

4. A polar bear is homozygous recessive for claw length.

Page 9: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Sample Problem• T represents the gene for TALL in pea plants• t represents the gene for short in pea plants

So:TT & Tt both result in a TALL plant, because T is dominant over t. t is recessive. What will tt result in?

Remember there are two genes for every trait!

Page 10: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,
Page 11: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Write the 3 possible genotypes and phenotypes for the following:

Green eyes are dominant to blue eyes

(use the first letter of the dominant trait)

GG=Gg=gg=

Page 12: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Write the 3 possible genotypes and phenotypes for the following:

Curled toes are dominant to straight toes

(use the first letter of the dominant trait)

CC= Cc= Cc=

Page 13: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Let’s cross a homozygous tall plant (TT) with a short plant (tt).Each plant will give only one of its’ two genes to the offspring.

TT x tt

T T t t

Page 14: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

T T t t

Each gene (allele) separates from the other so that the offspring get only one gene from each parent for a given trait.

T T t t

TT x t t

Page 15: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Predict the offspring if a tall plant (TT) is crossed (mates) with a short plant (tt)

TT x tt

Page 16: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Tt Tt

Tt t

The genes from one parent go here.

The genes from the other parent go here.

Page 17: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

T T

t Tt Tt

t Tt Tt

Page 18: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

T T

t Tt Tt

t Tt Tt

If a box receives a capital letter and a lower-cased letter we write the capitol letter first

Page 19: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Possible offspring Genotype =

Page 20: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Possible offspring Genotype = Tt.

Page 21: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Possible offspring Genotype = Tt.What percent of offspring will have the following genotypes:

TT=Tt=tt=

Page 22: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Possible offspring Genotype = Tt.What percent of offspring will have the following genotypes:

TT= 0%Tt= 100%tt= 0%

Page 23: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Possible offspring Genotype = Tt.What percent of offspring will have the following genotypes:

TT= 0%Tt= 100%tt= 0%

Possible offspring phenotype =

Page 24: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Possible offspring Genotype = Tt.What percent of offspring will have the following genotypes:

TT= 0%Tt= 100%tt= 0%

Possible offspring phenotype = tall.

Page 25: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Possible offspring Genotype = Tt.What percent of offspring will have the following genotypes:

TT= 0%Tt= 100%tt= 0%

Possible offspring phenotype = tall.What percent of offspring will have the following phenotypes:

Tall=Short=

Page 26: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Possible offspring Genotype = Tt.What percent of offspring will have the following genotypes:

TT= 0%Tt= 100%tt= 0%

Possible offspring phenotype = tall.What percent of offspring will have the following phenotypes:

Tall= 100%Short= 0%

Page 27: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Black rabbits are dominant to brown. Two heterozygous rabbits have offspring. Predict what percentage of their offspring will be brown.

Page 28: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Black rabbits are dominant to brown. Two heterozygous rabbits have offspring. Predict what percentage of their offspring will be brown.

Step 1: Determine the genotype of parents. Always use the first letter of the dominant trait. ____________x _____________

Page 29: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Black rabbits are dominant to brown. Two heterozygous rabbits have offspring. Predict what percentage of their offspring will be brown.

Step 1: Determine the genotype of parents. Always use the first letter of the dominant trait. ____________x _____________

Page 30: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Step 2: Set up a Punnett Square

Page 31: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Step 2: Set up a Punnett SquareStep 3: Complete Punnett Square

Page 32: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Step 4: Predict offspring phenotype.

Page 33: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Black rabbits are dominant to brown. Two heterozygous rabbits have offspring. Predict what percentage of their offspring will be brown?

Page 34: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,
Page 35: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Tall plants are dominant to short. Cross two heterozygous pea plants.

1. Determine parent’s genotype and write on whiteboard

Your Turn!!

Page 36: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Set up a punnett square and fill it in.Hold up whiteboard

Page 37: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

T t

T TT Tt

t Tt tt

Page 38: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Determine the genotype percentages and write on whiteboard TT= Tt= Tt=

Page 39: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

T t

T TT Tt

t Tt tt

Genotype percentage : TT – 25%

Page 40: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

T t

T TT Tt

t Tt tt

Genotype percentage: TT – 25%, Tt – 50%

Page 41: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

T t

T TT Tt

t Tt tt

Genotype percentage: TT – 25%, Tt – 50%, tt – 25%

Page 42: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Determine the Phenotype percentages and write on whiteboard Tall= Short=

Page 43: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

T t

T TT Tt

t Tt tt

Genotype percentage: TT – 25%, Tt – 50%, tt – 25%

Phenotype percentage: Tall – 75%

Page 44: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

T t

T TT Tt

t Tt tt

Genotype percentage: TT – 25%, Tt – 50%, tt – 25%

Phenotype percentage: Tall – 75%, short – 25%

Page 45: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Round seeds are dominant to wrinkled seeds.

Rr x rr    What percentage of the offspring will be round? _______________

Page 46: Create a gene and a corresponding allele on your whiteboard Gene: _____________ Allele: ________, _________ Alleles (variations of trait) -Purple, blue,

Classwork: Punnett Packet Pages 1-?

Homework: Punnett Packet Pages ?-? (due tomorrow)


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