Dosage compensation

Equalization in males and females of the amount of protein produced by X-linked genes.

Each female cell one of the two X chromosome becomes inactive. Which X chromosome is inactivated is random.

The Xist (X inactive specific transcript) gene located on the X chromosome, in required for inactivation. 

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#Unit 13. Methods in Biology

Atrial repolarization is not seen on a normal ECG because it is “buried” in the QRS complex.

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#Unit 2. Cellular Organization

Na+/K+ ATPase generates the low cytosolic Na+ and high cytosolic K+ concentrations. 

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#Unit 11. Evolution and Behavior

Alfred Russel Wallace- Who was collecting specimens in the Malay Archipelago, had independently conceived of natural selection.

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#Unit 4. Cell Communication and Cell Signaling

MHC molecules in mouse

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#Id: 6055

#Unit 10. Ecological Principles

Taiga, Northern Coniferous Forest, or Boreal Forest  The climate is one of short, cool summers and long winters with abundant snowfall. Precipitation is generally between 40 and 70 cm, often occurring in the form of snow.

Most of the trees are evergreens or conifers with tough needles, hence its similarity to temperate rain forest.