The diploid character of eukaryotic cells may mask the appearance of a mutation since...

A) this may be a frame shift
B) the mutation is often reversible
C) the mutation may be palindromic
D) the matching chromosomes may carry the dominate gene

The diploid character of eukaryotic cells may mask the appearance of a mutation because the presence of an extra copy of each chromosome can hide the effects of a mutation. To understand this better, let's break down the options and discuss them one by one:

A) Frame shift: Frame shift mutations occur when one or more nucleotides are added or deleted from a DNA sequence, causing a shift in the reading frame. While diploid cells can still undergo frame shift mutations, the diploid nature of the cells itself doesn't directly influence the appearance of this type of mutation.

B) Reversibility: This option suggests that the mutation is often reversible, which means it can be reversed back to its original form. While some mutations are reversible through DNA repair mechanisms, the diploid nature of eukaryotic cells is not directly related to the reversibility of mutations.

C) Palindromic mutation: A palindromic mutation occurs when a DNA sequence reads the same backward as forward. However, the diploid nature of eukaryotic cells does not specifically affect the occurrence or visibility of palindromic mutations.

D) Dominant gene on matching chromosomes: This option suggests that the presence of matching chromosomes carrying the dominant gene may mask the appearance of a mutation. This can happen when an individual has one normal copy of a gene (dominant allele) and one mutated copy (recessive allele). In diploid cells, the normal allele can compensate for the effects of the mutation, resulting in a phenotypically normal appearance.

Therefore, in the given options, D) "the matching chromosomes may carry the dominant gene" is the most appropriate choice. The presence of a dominant allele on matching chromosomes can mask the appearance of a mutation, making it less visible or having no visible effect on the phenotype of an organism.

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