Determination of Traits

All in the Family

“Paper Pets”

Table 1: Genotypes and Phenotypes for All in the Family "Paper Pets"

Phenotype Genotype- Allele Combination

Dominant Recessive TraitsHomozygous

DominantHeterozygous

DominantHomozygous

Recessive

OVAL TRIANGLE Nose NN Nn nn

SQUARE ROUND Eyes EE Ee ee

POINTED SQUARE Teeth TT Tt tt

BLUE YELLOW Color CC Cc cc

Gender

Male= XY

Female= XX

Baby 1Nn

MOMNN

NOSE Example 1

Possible Allele CombinationsWith Phenotype Expressed

NNHomozygous Dom.

Oval

NnHeterozygous Dom.

Oval

nnHomozygous Rec.

Triangle

DADnn

Flip a Coin for each parent:Heads – Left AlleleTails – Right Allele

Baby 1nn

DADNn

NOSE Example 2

Possible Allele CombinationsWith Phenotype Expressed

NNHomozygous Dom.

Oval

NnHeterozygous Dom.

Oval

nnHomozygous Rec.

Triangle

MOMNn

Flip a Coin for each parent:Heads – Left AlleleTails – Right Allele

Gender: Male or FemalePossible Allele CombinationsWith Phenotype Expressed

XXFEMALE

XYMALE

XX

MOM

XY

DAD

XY Baby 1Flip a Coin for each parent:Heads – Left AlleleTails – Right Allele

Example Combinations 2007

More Examples