Biology › Section G · Chromosomes and DNA › Topic G.1
Chromosomal theory and gene linkage
Mendel described genes without ever seeing one. A generation later, microscopes caught chromosomes behaving exactly as his 'unit factors' had to - and fruit flies, corn, and one undergraduate's all-nighter turned abstract ratios into physical maps of genes lined up along chromosomes.
In this topic
- Chromosomes carry the genes
- Why the theory fits Mendel
- Morgan's flies settle the argument
- Crossing over unlinks alleles
- Parental and nonparental gametes
- Recombination frequency measures distance
- Sturtevant's all-nighter
- The 0 to 50 percent scale
- Worked example: reading a test cross
- Worked example: ordering three genes
- Common mistakes to avoid
- Key takeaways
This topic is part of Wuanberri Pro. Checking your access…