The alleles are the alternative form of the genes. When a heterozygous is crossed with a pure recessive, then 50% of offspring will have unattached earlobes. Thus, option C is correct.
Dominant alleles are the gene forms that are expressed chiefly in heterozygous and purebred conditions and repress the expression of the recessive genes.
The unattached earlobes (E) are dominant traits whereas the attached earlobes (e) are recessive traits that can only be expressed in purebred conditions.
The cross between the heterozygous woman and man with attached earlobes is attached to the image below. From the cross, it can be seen that half or 50% of offspring have attached earlobes while the rest 50% have unattached earlobes.
Therefore, 50% of offspring have unattached earlobes.
Learn more about dominant alleles here:
https://brainly.com/question/14132766
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The image of the cross is attached below.
