In humans, genes are passed to an offspring from two parents. Thus, option "D" is correct.
Chromosomes are passed from parents to offspring via sperm and eggs. The specific kind of chromosome that contains a gene determines how that gene is inherited.
Consequently, each person has two copies (alleles) of every gene carried on an autosome: one inherited from their father and one from their mother.
Thus, option "D" is correct.
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