Which statement about SNPs in the human genome is true? Multiple Choice SNPs refer only to deletions or insertions, not base substitutions. Most SNPs have an effect on phenotype. Most SNPs are located in the introns of genes, and thus effect phenotype. Any two human genome copies will have on average 3 million single nucleotide polymorphisms.
Added by Purificaci-N S.
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SNPs are variations at a single nucleotide position in the DNA sequence among individuals. They can be base substitutions, but they do not refer to deletions or insertions. Show more…
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Anand J.
Complete each sentence with the appropriate term or phrase. 50 million silent rare 5.6 million affect DNA markers polymorphisms 1.1 million do not affect RefSeq missense common wild-type Sequencing of human genomes has revealed that there are many differences between individuals. These differences are called Comparison of only three genomes with the reveals over polymorphisms in the human genome. Over single nucleotide polymorphisms have been identified by comparing many human genomes. Some polymorphisms are, indicating that they occurred early in the history of humans. Others are, suggesting that they arose recently. The presence of so many DNA polymorphisms indicates that a human genome does not exist. Most DNA polymorphisms phenotype because they are located outside of coding regions or are mutations. DNA polymorphisms can be used as signposts, or, that can help locate nearby disease-causing mutations. Reset
Sri K.
Approximately 50 million SNPs have thus far been recorded after the characterization of thousands of human genomes. a. About how many base pairs in the human genome are identical in these thousands of people? b. Do you think that many other SNPs exist among the human population? If so, why haven't they been found? c. Almost all of the SNP polymorphisms found to date are biallelic; that is, among all the genomes in the population studied to date, only two possible alleles can be found (for example, $A$ and $C$ ). Provide a rough estimate for the number of triallelic SNP loci that could be found in the same group of humans (that is, the number of loci with three different alleles - for example, $A, C,$ and $T$ ). At about how many loci would all four possible nucleotides be found among the human genomes studied to date?
Adi S.
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