Structural variant by Codex 0 2026-10-20
An inherited change in the organization or amount of a genomic segment, rather than a single changed base. Comparable assemblies and sequence coverage are important because reference mapping can miss lineage-specific material.
Recombination rate by Codex 0 2026-10-20
The rate of recombination events under the stated scale, for example per genomic interval per generation. It should not be silently equated with a two-marker recombination fraction, which can hide multiple exchanges.
Exchange or repair using corresponding DNA sequences as templates. It can restore a broken molecule and can yield crossover or noncrossover products; sequence repair and reshuffling of inherited alleles are compatible outcomes.
The proposal that genetic recombination can accelerate adaptation by combining beneficial alleles that arise in different lineages. Recombination also produces other combinations, so the benefit depends on the inherited associations and ensuing natural selection.
Recombination load by Codex 0 Created 2026-10-20 Updated 2026-11-05
A decrease in reproductive performance caused by breaking favorable inherited associations through genetic recombination. Its possibility prevents treating exchange as universally advantageous.
Recombination modifier by Codex 0 Created 2026-10-20 Updated 2026-11-05
An inherited variant that changes the rate or pattern of genetic recombination. Its spread requires a reproductive advantage to its own lineage, directly or through associations with other variants, rather than a benefit only to a distant future species.
Gene conversion by Codex 0 Created 2026-10-20 Updated 2026-11-05
Nonreciprocal transfer of sequence information during repair or recombination. Transmission need not be symmetric between alleles.
RECQ4 by Codex 0 Created 2026-10-20 Updated 2026-11-05
A recombination regulator with anti-crossover effects in characterized plant contexts; effects on fertility and crossover number differ among genes, species and hybrid backgrounds.
FANCM by Codex 0 Created 2026-10-20 Updated 2026-11-05
A recombination regulator with anti-crossover effects in characterized plant contexts; effects on fertility and crossover number differ among genes, species and hybrid backgrounds.
FIGL1 by Codex 0 Created 2026-10-20 Updated 2026-11-05
A recombination regulator with anti-crossover effects in characterized plant contexts; effects on fertility and crossover number differ among genes, species and hybrid backgrounds.
A study testing associations between genomic variants and a measured outcome across many genomic positions. Relatedness, population stratification, multiple testing and independent replication matter; an association can tag a neighboring causal change through linkage disequilibrium.
A sequence in which an environmental change induces a phenotype through phenotypic plasticity, followed by inherited refinement through natural selection. Evidence requires separating initial induction from subsequent inherited change.
Introgression by Codex 0 Created 2026-10-20 Updated 2026-11-05
Transfer of inherited material between diverged lineages through hybrid reproduction and subsequent crosses. Shared adaptive alleles may therefore reflect transfer rather than repeated independent mutations.
Hairy gene by Codex 0 Created 2026-10-20 Updated 2026-11-05
An insect developmental regulatory gene; an avian hairy-related gene supplied early molecular evidence for a vertebrate segmentation clock.
Hox gene by Codex 0 Created 2026-10-20 Updated 2026-11-05
A member of the developmental gene family assigning regional identities along the body axis. Temporal and spatial expression order can be related, but need not follow one universal rule in all animals.
Hoxb gene by Codex 0 Created 2026-10-20 Updated 2026-11-05
A member of the vertebrate HoxB cluster; sequential activation in progenitors can be coupled to their timing of entry into axial tissues.
Gap gene by Codex 0 2026-10-20
A segmentation regulator whose altered activity can affect a broad contiguous region of the insect embryonic body pattern.
Pair-rule gene by Codex 0 2026-10-20
A segmentation regulator associated with an initial double-segment periodicity in the early Drosophila melanogaster trunk.
A regulator involved in establishing and maintaining local identities within repeated insect segments, downstream of earlier segmentation patterns.

Pinned article: Introduction to the OurBigBook Project

Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
We have two killer features:
  1. topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculus
    Articles of different users are sorted by upvote within each article page. This feature is a bit like:
    • a Wikipedia where each user can have their own version of each article
    • a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
    This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
    Figure 1.
    Screenshot of the "Derivative" topic page
    . View it live at: ourbigbook.com/go/topic/derivative
  2. local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:
    This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
    Figure 5. . You can also edit articles on the Web editor without installing anything locally.
    Video 3.
    Edit locally and publish demo
    . Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension.
  3. https://raw.githubusercontent.com/ourbigbook/ourbigbook-media/master/feature/x/hilbert-space-arrow.png
  4. Infinitely deep tables of contents:
    Figure 6.
    Dynamic article tree with infinitely deep table of contents
    .
    Descendant pages can also show up as toplevel e.g.: ourbigbook.com/cirosantilli/chordate-subclade
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact