your other biology professor

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Hi, biology friends! I’m Sarah, your other biology professor. I've got a PhD in genetics (I ❤️🧬), and after years of teaching a bunch of different college bi...

Latest Videos

Semiconservative DNA Replication Meselson-Stahl Experiment Explained!

Recessive vs Dominant Epistasis - What's the Difference

Prokaryotes vs Eukaryotes DNA Replication Differences!

Shut It Down! X Chromosome Inactivation

Compare Euchromatin and Heterochromatin!

Wrap It Up! Chromatin and DNA Packaging

Let's Work Some Test Crosses!

Sodium Potassium Pump Why Pump 3 Na+ Out and 2 K+ In

Transcription Simplified - from DNA to RNA!

In or Out (of the Cell Cycle) What is G0

Let's Double-Check Cell Cycle Checkpoints!

Move it Along! Cyclins, CDKs and the Cell Cycle

Shrinking Chromosomes Telomeres and the End Replication Problem

How to Identify Macromolecules (Biomolecules)

The Cell Membrane How to Identify and Draw Structures

Prokaryotes vs Eukaryotes Translation Differences!

Prokaryotes vs Eukaryotes Transcription Differences!

Lac Operon Mutations Why Won't It Turn Off

One Sugar or Two Glucose and the Lac Operon

On or Off Understand the Lac Operon!

When Mom's DNA Calls the Shots Genetic Maternal Effects

Lethal Alleles Explained Recessive and Dominant Lethals with Examples

Expect the Unexpected Phenotype Penetrance and Expressivity

Tryptophan Operon Simplified Repression and Attenuation

What Does Upstream Mean on DNA and RNA

Genotype and Phenotype Explained! With Examples

Chargaff's Rules Review and Practice

Label a Transcription Bubble direction, 5' and 3', strand names

Operons Positive, Negative, Inducible, and Repressible! [Gene Regulation]

Leading and Lagging Strands - What's the Difference Label Leading and Lagging Strands!