AP Biology teachers who bring The Immortal Life of Henrietta Lacks into a genetics or cell biology unit are usually trying to do two things at once: teach the science of immortalized cell lines and open a conversation about the ethics of tissue research. Grading student essays that sit at that intersection is trickier than grading a standard lab report, because a response can be scientifically accurate while completely missing the ethical stakes, or the reverse. Most rubrics teachers already use for lab writeups do not transfer cleanly, since they were built to score procedure and data analysis rather than moral reasoning. Building a rubric specifically for this crossover assignment prevents both halves of the assignment from getting shortchanged.

The cleanest way to handle this is to split the rubric into two explicit strands scored separately: scientific content and ethical reasoning, each worth roughly half the grade. Scientific content should check whether the student correctly explains what made HeLa cells unusual, namely their ability to divide indefinitely outside the body, and whether they connect that property to specific research applications like the polio vaccine or cancer studies. Ethical reasoning should check whether the student engages with informed consent as it existed in 1951 versus how it functions today, rather than judging the past purely by present-day standards. Keeping the strands separate stops a strong science explanation from masking weak ethical thinking, or vice versa.

Many students, particularly strong science students, default to a purely utilitarian argument that the medical benefits justify what happened to Henrietta Lacks, and a good rubric should not penalize that position outright. What it should reward is whether the student acknowledges the counterargument, specifically the harm to the Lacks family and the racial context of Johns Hopkins in the 1950s, before reaching their conclusion. An essay that never mentions the family's decades of not knowing their mother's cells were used cannot earn full marks on the ethics strand, regardless of how well it explains cell immortalization. That distinction needs to be stated plainly in the rubric language so students know what depth looks like before they start writing.

Common Science Errors Worth Flagging

Students frequently confuse HeLa cells with stem cells or assume the immortality refers to the cells lasting inside Henrietta Lacks's own body rather than in laboratory culture, and both errors are worth catching with specific feedback rather than a generic point deduction. Another common mistake is describing HeLa cells as "cancerous" without explaining that it was specifically an aggressive cervical cancer that gave the cells their unusual replicative properties. Flagging these errors with a short explanatory note rather than just marking them wrong turns the correction into a teaching moment students are more likely to remember on the AP exam.

• Require students to name at least one specific medical advance that used HeLa cells
• Ask for an explicit definition of informed consent as understood in the 1950s
• Score whether the essay separates the science claim from the ethics claim clearly
• Give partial credit for acknowledging counterarguments even if the final position differs
• Flag vague phrases like "it was wrong" that skip the reasoning behind the judgment

Handling the Volume of a Full Course Load

AP Biology teachers typically manage five or six sections, which means an ethics essay assignment can generate well over a hundred papers within a single grading window, on top of labs, quizzes, and exam prep. A two strand rubric actually speeds this up once teachers get used to it, because they can score the science strand quickly using content checklists and slow down only for the ethics strand, where more individualized reading is genuinely necessary. Some teachers score the science strand in one pass across all sections and the ethics strand in a second pass, which keeps the mental mode consistent and reduces the fatigue that comes from constantly switching between checking facts and evaluating arguments.

Short, targeted comments work better than exhaustive feedback given the volume involved, especially since most students will not revise this particular essay before moving on to the next unit. A single sentence pointing to where the ethical reasoning needed one more step, paired with a specific science correction if needed, gives students something concrete without demanding an hour of writing per essay from the teacher. Saving longer, more detailed feedback for a smaller subset of essays, such as those the teacher plans to discuss in class as models, is a reasonable way to manage the tradeoff between depth and time.

Connecting the Essay Back to the AP Exam

The College Board's free response questions increasingly ask students to reason about the social and ethical dimensions of biological research, not just recite mechanisms, which makes this essay genuinely useful exam preparation rather than a detour from the curriculum. Framing the assignment that way to students, explicitly connecting the skill of weighing competing values in a scientific context to what they will face on exam day, tends to raise the seriousness with which they approach the writing. Teachers who skip that connection sometimes find students treat the ethics essay as a break from real biology, which shows up in shallower responses.

It also helps to show students a released free response question that touches on research ethics or data use alongside the Henrietta Lacks essay prompt, so they can see the family resemblance between the two tasks. That comparison makes the grading criteria feel less arbitrary, since students can see the same skill of balancing evidence and values showing up in a format they know will be tested. Over a full year, that repeated practice with ethical reasoning in a scientific context tends to produce noticeably stronger responses by the time the actual exam free response section arrives.