Question

(16 pts.) The gel shown below shows patterns observed for a STR (short tandem repeat) locus among four sets of parents (1-8) and four children (A-D). One child comes from each set of parents. 3. Why are there two bands for each parent? a. b. Although all the people shown here have two bands, it is possible (and not unusual) fora person to have only one band. Explain how this could happen. Consider earlier discussions on extensions to Mendelian genetics. What type of dominance is illustrated by the STR alleles? Explain c. Which pairs of people who have the DNA in lanes 1-8 are the parents of each child? Explain. Note that parent pairs are not necessarily shown next to each other on the gel d. 1 2 345678 ABCD

Answer 1

Question 3)

A) As we know that there are two alleles for a gene. That's why there are two STR band for one sequence.

B) If there is deletion in the sequence or chromosomal translocation, then one of the STR is missed.

C) It is showing co-dominance nature. Because both of the bands are visualised in the gel.

D) please look in the image for solution.

Note that parent pairs are not necessarily shown next to each other on the gel. A has parents 2 and 7 i9 B has parents 1 and 4 C has parents 6 and 8 12345678ABCD D has parents 3 and 5