Segmentation gene

Gene involve in early stages of segmentation

A segmentation gene is a gene involved in the early stages of pattern formation that define repeated units (metameres) in a segmented organism, usually the embryo.[1] They are classified into 3 groups: gap genes, pair-rule genes, and segment polarity genes.[2] The expression of gap genes result in the formation of gaps in the normal pattern of structure in the embryo.[3] Expression of pair-rule genes subdivides the embryo into a series of stripes and sets the boundaries of the parasegments.[4] Segment polarity genes define the anterior and posterior polarities within each embryonic parasegment.[5]

## References

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1. ^ "Segmentation gene - definition from Biology-Online.org". 2009-01-07. Retrieved 2009-12-14.
2. ^ "Segmentation gene - Biology-Online Dictionary". www.biology-online.org. Retrieved 2017-03-03.
3. ^ "Gap gene - Biology-Online Dictionary". www.biology-online.org. Retrieved 2017-03-03.
4. ^ "Pair-rule gene - Biology-Online Dictionary". www.biology-online.org. Retrieved 2017-03-03.
5. ^ "Segment polarity gene - Biology-Online Dictionary". www.biology-online.org. Retrieved 2017-03-03.

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