Earlobes can either be attached to the cheek or be ‘free’ (unattached). This characteristic is controlled by a single gene.
The allele for attached earlobes is recessive.
The diagram shows the inheritance of attached earlobes in one family.
Which two individuals must be heterozygous for earlobe attachment?
1 and 7
2 )
3 and 4
3 )
5 and 8
4 )
6 and 9
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