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BIO 100 Genetic Problems Worksheet

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1. In humans free earlobes are dominant over attached earlobes.
Free Ear = EE
Attached ear = ee
a. Draw the punnett squares for a cross between two heterozygous parents.
E
e
E
EE
Ee
e
Ee
ee
b. What are the phenotypic and genotypic ratios?
Genotype 25% = EE
50% = Ee
25% = ee
Phenotype 75% Free earlobes
25% attached earlobes
2. In carnations, flower color is inherited by incomplete dominance. The two alleles are for the
colors red and yellow.
a. If you cross an orange carnation with a yellow carnation what offspring will you get? Draw the
punnett squares and list phenotypic and genotypic ratios.
50% yellow
50% orange

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F y
F y
Fy
F y F y
F y F y
F r
F r F y
F r F y
Phenotype 50% yellow
50 % orange
Genotype Fy Fy 50%
Fr Fy 50%
b. If you have one orange carnation, how can you get the highest ratio of red carnations? Draw
the punnett squares and list the phenotypic and genotypic ratios.
Fy
Fr
Fr Fy
Fr
Fr Fy
Genotype 50% Fr Fr
50% Fr Fy
Phenotype 50% red
50 % orange
3. Using the pedigree please find
a. pattern of inheritance:

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1. In humans free earlobes are dominant over attached earlobes. Free Ear = EE Attached ear = ee a. Draw the punnett squares for a cross between two heterozygous parents. E e E EE Ee e Ee ee b. What are the phenotypic and genotypic ratios? Genotype 25% = EE 50% = Ee 25% = ee Phenotype 75% Free earlobes 25% attached earlobes 2. In carnations, flower color is inherited by incomplete dominance. The two alleles are for the colors red and yellow. a. If you cross an orange carnation with a yellow carnation what offspring will you get? Draw the punnett squares and list phenotypic and genotypic ratios. 50% yellow 50% orange Fy Fy Fy FyFy FyFy Fr FrFy FrFy Phenotype 50% yellow 50 % orange Genotype Fy Fy 50% Fr Fy 50% b. If you have one orange carnation, how can you get the highest ratio of red carnations? Draw the punnett squares and list the phenotypic and genotypic ra ...
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