In the following pedigree chart, the mutant trait is shade black. The gene responsible for the trait is.
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The trait exhibited in pedigree chart is autosomal recessive. An autosomal recessive trait appears in case of marriage between two heterozygous individuals or a recessive individual with hybrid or two recessives. It expresses the effect only in pure or homozygous state. If the trait has been controlled by dominant gene, then one of the parent must have possessed the dominant gene and hence the disease.
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