Question

3. Sam received the sequence above on the copy of the chromosome 2 he received from his mother. The copy he received from his father has 8 repeats on the same STR. a. What is Sam's genotype? b. If you used the primers you designed in question 1 to amplify this region of the genome from a preparation of DNA from Sam and then ran the PCR products on an agarose gel, how many bands do you think you would see? Explain. (hint: what are the different sizes of the resulting PCR products and what is the resolution of a 1% agarose gel?) 4. Why are STR loci (or any other DNA markers) with many alleles present at intermediate frequencies within a population more useful than loci in which one allele is very common and the others are very rare?

Answer 1

For (3) the previous question having other related data is required.

(4). Because availability of many alleles would help to analyze the 'variation' across the population in much better way.

English part -

1)Sentences using passive voice are---

(9)

Rewriting this in active voice would be like,

I/Someone will serve you light refreshments after the presentation.

2) Sentence using an expletive

(6) A mandatory meeting will be conducted on so and so dates.

3) Style problem in sentence 2--

Our decision is as a result of your helpful comment cards

4) d none of the above