Biologist
Explain a gene, an ecosystem, or natural selection in academic Spanish — out loud.
Advanced biology Spanish keeps genotype and phenotype apart: el genotipo is the genetic code, el fenotipo the observable trait, and blurring them is the classic error. Molecular processes are described in sequence — la transcripción before la traducción genética, carried by el ARN mensajero to build la proteína. Ecology has its own register: el ecosistema, la cadena trófica (though in daily Mexican speech it's la cadena alimenticia), el nicho ecológico, la biodiversidad. And frame evolution as outcome, not goal: la selección natural and la adaptación are results, not intentions — even if everyone summarizes it as el más fuerte sobrevive.
Below: the vocabulary lesson by lesson, where the everyday word drifts from the textbook one, the pitfalls — and a way to explain the science out loud, no flashcards, no drills.
The warm-up pack
How biology vocabulary actually gets said in a lab, a lecture, or an argument at dinner.
01 · How you actually spell out DNA
Se dice el a-de-ene, letra por letra.
You say it el a-de-ene, letter by letter. (never spelled out in English)
DNA gets spelled out Spanish-style, letter by letter — never the English "D-N-A." Small thing, but it's the first tell of a non-native speaker.
02 · What a labmate asks you in the lab
Che, ¿corriste el gel del ADN?
Hey, did you run the DNA gel? (Argentina)
Real lab talk, not textbook talk — corriste el gel is exactly how a colleague asks if you've done the electrophoresis.
03 · Saying a trait is hereditary
Le salió en los genes.
It's in her genes.
This is how genotipo actually gets discussed outside a lecture — a trait "coming out" in someone's genes, not "expressing a genotype."
04 · The question researchers actually argue about
¿Se está expresando el gen o no?
Is the gene expressing or not? (Argentina, lab jargon)
This is la expresión génica exactly as grad students actually argue about it — a yes/no question, not a definition.
05 · How mRNA entered everyday conversation
Me puse la de ARN.
I got the mRNA one. (referring to the vaccine)
ARN mensajero became everyday vocabulary after the pandemic — this is the exact sentence people used to talk about which vaccine they got.
06 · The everyday word for food chain
La cadena alimenticia es la palabra que usamos, no la trófica.
Here we say food chain, not "trophic chain."
Cadena trófica is the textbook term — cadena alimenticia is what people actually say, and using it doesn't make you less precise.
07 · A biology word people use about themselves
Che, encontró su nicho.
He found his niche. (Argentina, used about people)
Nicho ecológico escapes the biology lecture constantly — Argentines use it about a person finding where they belong, same word, wider life.
08 · The famous line that's slightly wrong
El más fuerte sobrevive.
The strongest survives. (the popular, imprecise shorthand for natural selection)
Everyone says this, and it's not quite right. Selección natural isn't about strength, it's about what survives to reproduce. Say the popular version, then correct it — that's the actual skill.
09 · A verb borrowed straight from evolution
Eso ya evolucionó.
That's already evolved. (used loosely — "that's already changed")
Evolucionar escapes biology completely in everyday speech — said about a person, a team, a situation, with zero connotación biológica.
10 · How everyone talks about their own metabolism
Tengo el metabolismo lento.
I have a slow metabolism.
Metabolismo celular is the precise term; tengo el metabolismo lento is what everyone actually says about their own body, no "celular" attached.
11 · The word actually in the news, not the textbook
El maíz transgénico es tema de debate.
GMO corn is a hot topic. (transgénico — far more common than the formal term)
Nobody says organismo modificado genéticamente at dinner — transgénico is the word that's actually in the news and in people's mouths, especially about maíz.
FLUENT
Finally, someone to talk to in Spanish.
Ten-minute spoken lessons. A teacher who answers back — and gently fixes what you got wrong.
First 10 lessons freeandbefluent.com/spanish/biologistRegional Spanish
Textbooks teach one word. Locals use several — pick your region's and stay consistent.
Watch out
The part no drill site can do
Olivia
Your vocabulary teacher for this pack
In the Biologist lessons you learn the vocabulary by explaining it, out loud, to Olivia. She sits in as a room of biology students and asks you to explain la expresión génica, la mutación and el ADN recombinante. Then she moves you to an ecology fieldwork briefing — describe the dynamics: la cadena trófica, la biodiversidad, el nicho ecológico. Finally an evolution seminar, where you discuss la selección natural, la adaptación and la especiación with real examples — talking, not memorizing.
Blank mid-sentence and nothing bad happens — she waits. That's the practice, without unnecessary judgement.
Finish the 6 lessons and Biologist is yours — earned, not given.
First 10 lessons free · 10-minute spoken lessons · your AI coaching team remembers you
Quick answers
El genotipo is the genetic code an organism carries; el fenotipo is the observable trait it produces. Always specify which you mean — it's the most common mix-up in biology Spanish. In casual talk Latin Americans often say la herencia rather than el genotipo.
El ADN, pronounced letter by letter — a-de-ene, never spelled out in English. Messenger RNA is el ARN mensajero, said a-erre-ene-eme. Post-pandemic, la vacuna de ARNm entered everyday speech.
The textbook term is la cadena trófica, but in daily Mexican and Costa Rican speech people say la cadena alimenticia — the technical one sounds like a thesis. Related: el ecosistema, el hábitat, la biodiversidad.
La selección natural, described as an outcome, not a goal — species don't try to adapt. The popular shorthand el más fuerte sobrevive (the strongest survives) is catchy but imprecise; pair it with la adaptación and la especiación for accuracy.
The formal term is el organismo modificado genéticamente, but in everyday Latin American speech and the press it's overwhelmingly transgénico — as in el maíz transgénico or la soja transgénica, both loaded political topics.
