> For the complete documentation index, see [llms.txt](https://docs.abi.am/abi-omicss-guide-2021/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.abi.am/abi-omicss-guide-2021/week-4/untitled.md).

# Molecular Biology

## What Are the Learning Outcomes of This Week?

By the end of week 4, you should:

* Have a solid understanding of pleiotropy and lethal alleles
* Know the basics of genetic linkage and mapping
* Be familiar with the concepts of pleiotropic plasticity and variation in species