Question

For following group of questions first study the description of the situation or data and then choose the one best answer to each question following it and fill in the corresponding oval on the answer sheet. The diagram below illustrates the results of electrophoresis of DNA sequences obtained from a family of two adults and three children, and amplified using PCR. The bands represent short repeating sequences of variable length. Results for another female (X) are included for comparison. Father Mother Child Child Child X Origin The banding patterns of the DNA fragments reveal that

Answer 1

Option C

First option is incorrect because both child one and child two can be biological siblings because they share one out of two bands.

Second option is incorrect because first child looks like mother because he shares one band with mother, but third child does not look like mother because he does not share any of the bands.

Third option is correct because the mother Can be the parent of first and second child because they share one of the two bands with the mother. The mother cannot be the biological mother of the third child because none of the bands is common.

Fourth option is incorrect because none of the bands is common between the mother and father and therefore they do not share any DNA.

Last option is incorrect Because second and third child has not received any DNA From the father because no band is common between them.

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