Question at position 22 Which polymorphism is most likely to affect an individual's phenotype?An SSR within a telomeric sequenceA DIP in an intragenic region between genesA SNP in an intron of a protein-coding geneA SNP in the start codon of a protein-coding gene

Question

BlackTom AI · Accepted Answer

Consider the question: which polymorphism is most likely to affect an individual's phenotype?
Option 1: An SSR within a telomeric sequence. Simple sequence repeats in telomeres are usually involved in chromosomal stability and aging, but a polymorphism here is less likely to alter a specific phenotype directly because telomeric regions are often heterochromatic and not coding, making phenotypic effects indirect or context-dependent.
Option 2: A DIP in an intragenic region between genes. If this region truly lies between genes (intergenic rather than intragenic), a small deletion (DIP) would typically have minimal effect on a single gene’s function unless it disrupts regulatory elements like enhancers that control nearby genes; however, the likelihood of a clear, direct phenotype change is uncertain without showing regulatory impact.
Option 3: A SNP in an intron of a protein-coding gene. Intronic SNPs can affect splicing or regulatory motifs, potentially influencing gene expression, but many intronic variants are neutral. While some can alter phenotype, they are less consistently impactful across alleles than changes that affect the coding sequence or initiation.
Option 4: A SNP in the start codon of a protein-coding gene. The start codon is critical for translation initiation; a SNP here can prevent proper initiation, alter the reading frame, or change translation efficiency, leading to a concrete and often observable phenotypic effect. This type of variant is most directly tied to altering the protein product and phenotype, compared to the more indirect effects of the other options.
In summary, while several kinds of polymorphisms can impact gene function, a SNP at the start codon has the most direct and robust potential to alter the protein produced and, consequently, the phenotype, more so than variations in noncoding regions or distal regulatory contexts.

Question at position 22 Which polymorphism is most likely to affect an individual's phenotype?An SSR within a telomeric sequenceA DIP in an intragenic region between genesA SNP in an intron of a protein-coding geneA SNP in the start codon of a protein-coding gene单项选择题

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