Unattached earlobe Attached earlobe
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A family tree has been drawn below. Females are represented by
 and males by  .
The genotypes for free (unattached) or attached ear lobes of some members of this family have been written in.
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| NOTE: |
E – the dominant form of the gene, it causes 'free' ear-lobes. e – the recessive form of the gene, it causes 'attached' ear-lobes. |
Family Tree
| a) |
One of the genotypes has been written incorrectly.
Put a M in the square or circle to show which genotype is incorrect.
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| b) |
Shade in the or of all those individuals who would have attached ear-lobes. |