You just received a new case file. The patient, a young girl named Maya, has been struggling with developmental delays and distinct physical features that have puzzled her doctors for years. Her pediatrician has ordered a chromosomal analysis to look for genetic abnormalities.
This staining process creates distinct —dark regions rich in Adenine (A) and Thymine (T) base pairs—which are essential for identifying homologous pairs. Students must match chromosomes based on three specific features:
| Problem in Real Lab | Virtual Karyotyping Solution (UArizona) | |---------------------|------------------------------------------| | Limited microscope access | Available 24/7 on any laptop | | Stains fade; images are poor | High-quality, standardized digital metaphase spreads | | No patient context | Each case includes clinical history (phenotype first) | | No feedback if you match wrong | Immediate correction + teaching explanation | | Only normal karyotypes offered in many schools | Includes trisomies, sex chromosome disorders, deletions | virtual lab university of arizona karyotyping activity
You look closer. The first 20 pairs (autosomes) are perfect. But the 21st pair catches your eye. There aren't two chromosomes there. There are three.
The , hosted by The Biology Project , is a cornerstone of digital biology education. This virtual lab allows students to act as geneticists, analyzing real human chromosome data to diagnose genetic disorders. Activity Overview You just received a new case file
You pick up the vial containing Maya’s white blood cells. These cells aren't just sitting there; they are growing in a nutrient-rich culture. You need them to be in a specific phase of their life cycle— Metaphase .
Students navigate through the lab by following these standard procedures: Karyotyping Activity - The Biology Project This staining process creates distinct —dark regions rich
If you’re an instructor, assign the “Patient History First” version of the activity. It forces students to predict the karyotype before sorting—exactly how genetic counselors work. If you’re a student, do all 5 case studies in one sitting. Muscle memory for banding patterns takes only 45 minutes online… but weeks in a crowded lab.