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Crossing over

Crossing over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...

Crossing Over

Crossing Over

Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...

Crossing Over

Crossing Over

Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I, duplicated...

Routes of Persuasion

Routes of Persuasion

Persuasion is the process of changing our attitude toward something based on some kind of communication. Much of the persuasion we experience comes from outside forces. How do people convince others to change their attitudes, beliefs, and behaviors? What communications do you receive that attempt to persuade you to change your attitudes, beliefs, and behaviors?

Social Traps

Social traps are negative situations where people get caught in a direction or relationship that later proves to be unpleasant, with no easy way to back out of or avoid. The concept was orignally introduced by John Platt who applied psychology to Garrett Hardin's "Tragedy of the Commons", where in New England herd owners could let their cattle graze in the common ground. This situation seems like a good idea, but an individual could have an advantage. If they owned more cows, the larger...

Direct Motor Pathways

Direct Motor Pathways

The direct motor pathways, also known as the pyramidal tracts, are a group of neural pathways that originate in the brain and descend through the spinal cord. They control the voluntary movement of the body. There are two major direct motor pathways: the corticospinal and the corticobulbar tracts.
The corticospinal tract is responsible for the voluntary movement of the limbs and trunk. It originates in the cerebral cortex of the brain and descends through the cerebrum's internal capsule and the...

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Related Experiment Video

Updated: Jun 6, 2026

Assessing Human Spatial Navigation in a Virtual Space and its Sensitivity to Exercise

Assessing Human Spatial Navigation in a Virtual Space and its Sensitivity to Exercise

Published on: January 26, 2024

On getting there from here.

Steven L McKnight¹

¹Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390-9152, USA. steven.mcknight@utsouthwestern.edu

Science (New York, N.Y.)

|December 4, 2010

Summary

This summary is machine-generated.

Cellular regulation and metabolism are interconnected, influencing biological processes like aging and cancer. Understanding this reciprocal relationship is key to solving complex biological problems.

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Area of Science:

Cellular biology
Metabolic regulation
Systems biology

Background:

Physiological states in cells and tissues are influenced by regulatory systems and metabolic states.
Biological problems, including circadian rhythm, cancer, and longevity, show evidence of this connection.
The interplay between cellular regulation and metabolism is increasingly recognized.

Purpose of the Study:

To highlight the reciprocal relationship between cellular regulatory systems and metabolic states.
To emphasize the importance of understanding this interplay for advancing biological research.
To underscore the potential of this integrated approach for solving complex biological challenges.

Main Methods:

Review of existing studies linking cellular regulation and metabolism.
Conceptual framework development based on observed physiological evidence.
Analysis of regulatory mechanisms (transcription factors, signaling pathways) and metabolic dynamics.

Main Results:

Evidence suggests cellular regulatory states impact metabolic dynamics.
Reciprocal influence: metabolic states feedback to affect regulatory states.
This bidirectional communication is crucial for cellular function.

Conclusions:

The interconnectedness of cellular regulation and metabolism is fundamental to biological systems.
Understanding this reciprocity is essential for tackling previously intractable biological problems.
Future research should focus on the integrated study of regulatory and metabolic networks.