Q1) A genetic marker must meet the two following criteria 1. It identifies a uni
ID: 100873 • Letter: Q
Question
Q1) A genetic marker must meet the two following criteria
1. It identifies a unique location in the genome
2. It is polymorphic
The white gene of Drosophila meets the second of these criteria because
Select one:
a. the white gene resides at a specific spot near the end of the fly's X chromosome.
b. the eyes of Drosophila are large so it is easy to see their color.
c. the white gene is flanked by unique DNA sequences.
d. the white gene has two alleles w+ red eyes and w for white eyes.
Q2) Polymorphism in an STR marker is observed by bands on a gel with different mobilities that result from differences in the size of the DNA fragment produced by PCR. The source of this polymorphism in the genome is
a. variability in the length of the repetitive DNA that is between the DNA sequences that the primers anneal to.
b. unique DNA sequences that the PCR primers anneal to.
c. variable DNA sequences that the PCR primers anneal to.
Explanation / Answer
D) gene has two allele w+ for red eyes and w for the white eyes.
A is wrong because it meets with the first criteria of these two given and in question it is asked for second criteria.
B is wrong because it doesn't satisfy any of the criteria
C is wrong because it is not satisfying the second criteria of being polymorphic.
2) A - variability in the length of the repetitive DNA that is between the DNA sequences that the primers anneal to.
B is wrong because it unique sequence are not used as a markers.
C is wrong because variation in band is not because of variability in the DNA sequences.
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