Chapter 12 — Self-Check Quiz

Twenty-five questions: multiple choice and short answer. Answer before checking. The key is in the collapsed block at the bottom. The goal is calibration, not a grade — note why a wrong answer is wrong, especially where it overstates what bone can show.

Multiple choice

1. A forensic anthropologist is most likely to be called when: - A) a body is fresh and intact, with a clear cause of death - B) remains are decomposed, skeletonized, burned, or fragmentary - C) a living victim needs a sexual-assault examination - D) a toxicology screen is required

2. Which professional has the legal authority to determine cause and manner of death and sign the death certificate? - A) the forensic anthropologist - B) the crime-scene investigator - C) the medical examiner or coroner - D) the histologist

3. The single most reliable component of the biological profile, estimated from a complete adult skeleton, is generally: - A) ancestry - B) stature - C) age at death - D) sex

4. Age-at-death estimation is most precise for: - A) older adults, because degenerative changes accumulate - B) subadults, because dental development and epiphyseal fusion are tightly sequenced - C) middle-aged adults, because the pubic symphysis is most informative then - D) it is equally precise at all ages

5. Which component of the biological profile is the most scientifically and ethically contested? - A) sex estimation - B) stature estimation - C) ancestry estimation - D) age estimation

6. Perimortem bone fractures tend to be: - A) straight, transverse, and squared, with off-color margins - B) curved and beveled, with margins the same color as the surrounding bone - C) always accompanied by a healing callus - D) impossible to distinguish from postmortem fractures

7. A fracture with straight, jagged, right-angled edges whose broken surfaces are a different color from the bone's weathered exterior is most consistent with: - A) antemortem (healed) trauma - B) perimortem trauma - C) postmortem trauma - D) a gunshot wound

8. "Calcination" of bone refers to: - A) the earliest browning as bone begins to heat - B) the chalky white state after the organic component is gone, at high temperature - C) staining by acidic soil - D) rodent gnawing of bone edges

9. Heat-induced fractures in a fleshed body tend to be: - A) focal, radiating from a single point of impact - B) curved/concentric and following the heat gradient, not radiating from one point - C) always perfectly straight - D) identical to blunt-force fractures and indistinguishable

10. Blunt-force trauma to the skull is characterized by fractures that: - A) radiate outward from a focal point of impact, often with internal beveling - B) are diffuse and color-graded across the whole skull - C) only ever occur after the bone has dried - D) cannot be distinguished from heat fracturing

11. "Perimortem" most accurately means: - A) the exact instant of death, to the second - B) any time before death - C) around the time of death, while bone retained its fresh, moist, elastic properties - D) decades after death

12. Taphonomy is the study of: - A) tooth development and eruption schedules - B) everything that happens to remains between death and analysis - C) the chemistry of accelerants - D) handwriting on charred documents

13. Which of the following is a taphonomic process that can mimic or obscure perimortem trauma? - A) carnivore scavenging - B) soil pressure on buried bone - C) environmental weathering cracks - D) all of the above

14. A "possible human" bone fragment that is burned and fragmentary, with gross landmarks destroyed, should be reported as: - A) "definitely human" - B) "consistent with human; species not confirmed on gross examination," pending histology or molecular testing - C) "definitely non-human" - D) "cause of death undetermined"

15. The most definitive way to confirm that bone is human, when morphology cannot decide, is: - A) measuring its length - B) species-specific protein or DNA testing - C) weighing the fragment - D) asking the investigating detective

16. Stature estimation from long bones uses regression equations that are: - A) universal across all populations and both sexes - B) population- and sex-specific - C) only valid for subadults - D) unaffected by which bone is measured

17. From the skeleton alone, a forensic anthropologist can establish: - A) the identity of the assailant - B) that a perimortem blunt-force injury occurred, as a consistent-with finding - C) the exact weapon used, with certainty - D) the time of the blow to the minute

18. On the NAS 2009 / PCAST 2016 validity spectrum, skeletal trauma analysis is best described as: - A) at the very top, equivalent to single-source DNA, with a quantified error rate - B) in the broad middle: well grounded in bone biomechanics but interpretive, yielding consistent-with conclusions without a quantified error rate - C) discredited, like bite-mark matching - D) not a forensic method at all

19. A recovery of scattered skeletal remains is conducted like an archaeological excavation primarily because: - A) it looks more professional - B) the position and arrangement of remains is itself evidence (for time since death, movement, and perimortem vs. postmortem damage) - C) it is required to wear gloves - D) the bones are fragile

20. Sex estimation from the skeleton is reliable mainly in: - A) infants - B) young children - C) mature adults - D) all ages equally

Short answer

21. In one or two sentences, explain why fresh bone breaks like a "green branch" and dry bone breaks like a "dry stick." Name the biological factor responsible.

22. Give the honest, defensible wording for an adult age estimate, and explain why a single number (e.g., "47") is a red flag.

23. State the one thing a skeletal trauma finding cannot establish, no matter how clear the fracture is — the limit that protects against wrongful conviction.

24. In the cold case, the anthropologist determines the skull fracture is a perimortem blunt-force injury, not a fire artifact. Name the specific theory this rules out, and one thing it does not resolve.

25. Why is ancestry estimation especially vulnerable on cross-examination? Give one scientific reason and one wording problem.

Answer key (click to expand) **Multiple choice** 1. **B** — the anthropologist is called when soft-tissue methods cannot resolve the case (decomposed, skeletal, burned, fragmentary remains). 2. **C** — the medical examiner/coroner holds the legal authority and signs the certificate; the anthropologist supplies skeletal *findings*, not the cause-of-death determination. 3. **D** — sex, from a complete adult pelvis, is the most reliable single component. 4. **B** — growth indicators (dental development, epiphyseal fusion) are tightly sequenced, so subadults can be aged narrowly. 5. **C** — ancestry estimation is the least accurate and most contested, scientifically and ethically. 6. **B** — fresh bone fractures along curved, beveled lines, with margins the same color as the bone (it broke while whole and fresh). 7. **C** — straight/squared edges *plus* an off-color (un-weathered) interior indicate breakage of dry bone after death. 8. **B** — calcination is the chalky white, high-temperature state after the organic component is gone (charring is the earlier blackening). 9. **B** — heat fractures are diffuse, often curved/concentric, following the heat gradient, not radiating from one impact point. 10. **A** — blunt force has a *focus*: radiating fractures from a point of impact, often with internal beveling and inward displacement. 11. **C** — perimortem is bounded by bone *properties* (fresh, moist, elastic), not a precise instant; it can extend somewhat before and after the actual moment of death. 12. **B** — taphonomy is everything that happens to remains between death and analysis. 13. **D** — scavenging, soil pressure, and weathering can all mimic or obscure perimortem trauma. 14. **B** — confidence must scale to surviving evidence; the honest report is "consistent with human, species not confirmed," pending histology or molecular testing. 15. **B** — species-specific protein/DNA testing is the most definitive, because it rests on validated molecular biology. 16. **B** — regression equations are population- and sex-specific; using the wrong one introduces error. 17. **B** — the bone can support "a perimortem blunt-force injury occurred" as a consistent-with finding; it cannot name the assailant, the exact weapon, or the minute. 18. **B** — well grounded but interpretive; consistent-with conclusions, no quantified error rate; the broad middle of the spectrum. 19. **B** — the arrangement of remains is evidence; a cleanup destroys it permanently (as with the crime scene in Chapter 2). 20. **C** — sex estimation is reliable mainly in mature adults, because the relevant pelvic/cranial features develop with adolescence. **Short answer** 21. Fresh bone retains its organic collagen and moisture, making it slightly elastic, so it bends, hinges, and splinters along curved lines (green branch). Dry bone has lost collagen and moisture and is brittle, so it snaps along straight, squared lines (dry stick). The responsible factor is the bone's **collagen/moisture (organic) content**. 22. Honest wording is a *range*, e.g., "approximately 35–50 years." A single number for an adult skeleton is a red flag because post-growth age markers are slow and individually variable; precision degrades sharply with age, so a narrow estimate exceeds what the markers support. 23. It cannot establish *who delivered the blow* (or, with certainty, the specific weapon, or the exact timing). "A blow occurred" is the limit of the bone's voice; "this person struck it" is the convergence of other evidence, not anthropology — and treating a trauma finding as if it named a suspect is the overreach behind wrongful convictions. 24. It rules out the theory that the "fracture" was merely **heat-induced fire damage** (and thus that the death was accidental) — i.e., the "the skull just cracked in the fire" defense. It does *not* resolve who struck the blow, the specific weapon, or the precise timing; equivocal heat-damaged margins remain equivocal. 25. Scientific reason: "race"/ancestry is a social category that does not map cleanly onto continuous (clinal) biological variation, and the statistical methods are limited by their reference populations. Wording problem: a population estimate is probabilistic and should not be stated with the flat, categorical confidence of a sexed pelvis — presenting it that way misleads a jury.