Explain why any cell samples left at the scene of a crime by the perpetrator (e.

Question

Explain why any cell samples left at the scene of a crime by the perpetrator (e.g., semen, hair, skin) can be compared to blood samples of the suspects. A friend of mine here in Mesa has a citrus tree in his backyard that produces oranges on one limb, lemons on a second branch, and grapefruit on another. This magical tree is the product of grafting, a process in which limbs arc removed from one plant and inserted into cuts made in the trunk of another plant. After the wound heals, the grafted limb continues to grow and function as though it were always part of the tree. How would you expect the DNA fingerprints of the grafted limbs to compare to each other and to the roots of the tree one year after the grafts were performed? As time passes (say 10 years), would the DNA fingerprints become identical? Would they become more similar than they were initially? Explain your answer. The U. S. military now requires its members to provide DNA samples, in the form of cheek cells, which are kept on file. Why is this more advantageous than keeping fingerprints and/or dental records? Some individuals in the military have refused to provide DNA samples, even though it means being discharged from the service. What are the potential disadvantages of having ones DNA on file? A young woman is attacked on her way home. In the struggle she scratches the assailant, scraping some of his skin under her fingernails. Later at the police station, a police detective collects these cells and sends them to a laboratory for analysis. The pattern from the skin cells matches the DNA fingerprint of Larry Jones' blood sample. Witnesses also saw a man matching Larry's description running from the crime scene. Larry, however, seems to have an ironclad alibi; he was in jail at that time, arrested for DWI. Could Larry's twin brother Harry be the attacker?

Explanation / Answer

1. The genetic make up of the human has individual specific variable region which allows us to detect the suspect individual. Similar banding pattern in RFLP or RAPD of the sample DNA and suspect DNA confirms the suspect.

2. Due to evolution the newly grafted tissues might eventually lead to generation of new species where the newer onces will have DNA patterns similar to their both ancestors with new genetic imprints.

3. Having ones DNA on file will enable to identify the individual in the war field, to identify the person in case of destructive facial features to identify.

4. No the genetic makeup of even twins will be different with DNA fingerprinting, hence the suspect is only the person in the jail not his twin brother. More over the environment also causes changes the genomic imprint of a person, hence obviously there will not be 100% identical DNA pattern between twins even.

Related Questions

Navigate

• Browse (All)
• Browse E
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.