The Mechanism Was the Chromosomes All Along

You'll learnhow genes riding on chromosomes explain segregation, linkage, sex-linkage, and nondisjunction.

Mendel never saw a chromosome. He inferred rules from ratios, and the thing that made those rules true was sitting in every cell he crossed, pairing up and pulling apart. Eleven short steps; press Next for each one.

AP BIOLOGY · 11 STEPS · 6 QUICK CHECKS · GENES RIDE ON CHROMOSOMES · RF = MAP DISTANCE · MALES ARE HEMIZYGOUS ON THE X · v6

genes ride on chromosomes · and so do the exceptions

Before you start

What you're looking at

One homologous pair, drawn as condensed bars with a centromere pinch, each carrying two labelled gene loci.

The question

What does chromosome behaviour predict that Mendel’s ratios alone never could?

Step 1 / 11