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