Question

researchers have sequenced a gene in the population. they identified a polymorphic site within the gene...

researchers have sequenced a gene in the population. they identified a polymorphic site within the gene that can contain the SNP A, C, or T. How many alleles does the population contain for the gene ?
a. 3
b. 6
c. 9
d. 12

there isnt any other information and i was confused by the question too
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Answer #1

Answer:

(A) 3

SNP or single nucleotide polymorphism is a common phenomenon observed in a population . The change of one nucleotide may not be very important in some cases, but in most of the cases they determine the no of allele for that gene. Let's assume there is a gene ATGCC . It's polymorphic forms according to this questions may be A​​​​​​A​​​​​GCC or ACGCC (As the gene is polymorphic for A,T,C) . So there will be 3 types of genotypes for a single gene. Hence, there will be 3 forms of this genes or 3 alleles of this gene.

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