Dictionary > Pair-rule gene

Pair-rule gene

Definition
noun
A segmentation gene whose expression subdivides the embryo into a series of stripes, and sets the boundaries of the parasegments. It also regulates the subsequent expression of segment polarity genes.
Supplement
These genes are sequentially expressed next to the gap genes and before the segment polarity genes. In fact, the gene products of gap genes, together with those of maternal genes, activate pair-rule genes.
Examples of pair-rule genes are: even-skipped, hairy, runt, fushi-tarazu, odd-skipped, paired, odd-paired, sloppy-paired, and Tenascin major. Defect in any of these genes results in missing pattern elements in alternate segments. For instance, defective even-skipped gene results in even-numbered parasegments missing in the body pattern of the Drosophila larva.
See also: gap gene, parasegment, segmentation gene.


You will also like...

Hormone Production
Hormone Production

Hormones are chemical messengers produced by specialized glands and they were produced by switching on the genes designe..

Developmental Biology
Developmental Biology

Developmental biology is a biological science that is primarily concerned with how a living thing grows and attains matu..

Thermographic image of face and neck
Regulation of Organic Metabolism, Growth and Energy Balance

The human body is capable of regulating growth and energy balance through various feedback mechanisms. Get to know the e..

Sugar Homeostasis
Sugar Homeostasis

The blood sugar level is regulated by two hormones. The mechanism behind this type of negative feedback control is descr..

dinosaurs
The Dinosaurs

Dinosaurs represented a major turn in the evolutionary development of organisms on Earth. The first dinosaurs were presu..

Human gastrointestinal tract
Human Biology – Food and Digestion

This tutorial recognizes the importance of food as a source of energy that will fuel many biological processes. A good d..