Question

In the figure below, nucleotide position 17 represents what? Nucleotide position 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 C АТС GT TAC GT AG AG A G GT GAAT TGA Chromosomes from seven individuals FUUUUUUU QUUU1000 * MOO00000* COO000000 UUUUUUU 000000000 OUUOFFEE DO000000 FO0000 00000 EEEEEE 0000000 UUEEEE DDDDDDD 0000000 >>>>>> SOUUUUUU TOUUUUUU Terri UUUUUUU UUOFFEE* EEEEEEE 00000000 Indel Microsatellite O a locus O a single nucleotide polymorphism O a segregating site O both a locus and segregating site O both a locus, segregating site, and single nucleotide polymorphism QUESTION 19

Answer 1

The image shows the comparison of a particular chromosomal region in seven individuals where we can make out the similarities as well as differences in the given region.

At nucleotide position 17, the first three individuals have a Guanine nucleotide whereas the remaining four have a Thymine nucleotide. This clearly tells us that there is a change or a variation in a single nucleotide, and is termed single nucleotide polymorphism. Now, this is also a segregating site a term referred to sites that show differences (polymorphisms) in a sequence.  A locus refers to a specific position of a gene in a chromosome, or a DNA sequence, so this could also be termed an SNP locus.

The right answer here is the last option.