The main way a recessive allele would be fully expressed even when only one copy is present would be .

There are no options to this question, the options are:

A) Dominance

B) Recessive inheritance

C) Incomplete dominance

D) Sex-linked inheritance

The answer is D

Explanation:

Sex-linked inheritance is a kind of non-mendelian inheritance in which traits are transferred via genes on sex chromosomes. There are two sex chromosomes in humans namely: X and Y chromosomes. These traits that are inherited this way are called Sex-linked traits.

Since the Y chromosome is genetically inert, it does not contain any trait. Hence, traits can only be transferred on the X chromosome. Therefore, once a male or female receives the affected X chromosome, the traits will be expressed irrespective of whether it is dominant or recessive. Hence, the main way a recessive allele would be fully expressed even when only one copy is present would be via SEX-LINKED INHERITANCE.

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