BioScience Dictionary

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | Ot.

Found Polar 6 times.

Displaying results 1 to 10.

1. Polar
* Describes a feature or phenomenon occuring at the end (pole) of an object (such as a planet) or organism (such as an ameba ). * Describes a hydrophilic molecule or substance that dissolves in water. Compare nonpolar .

2. Polar body
A small cell which is the product of an uneven division of the cytoplasm during meiosis ; the smaller of the two cells produced during a meiotic division of oogenesis (the larger one becomes an oocyte or ovum ). It eventually degenerates.

3. Polar covalent bond
A covalent bond in which atoms share electrons in an unequal fashion. The resulting molecule has regions with positive and negative charges. The presence of polar covalent bonds allows other polar molecules to surround molecule: example: glucose sugar in water.

4. Polar flagellation
Condition of having flagella attached at one end or both ends of the cell.

5. Polar mutation (polarity mutation)
A mutation in a single gene which affects the rate of expression of other genes that are near it on a chromosome .

6. Polarity
* In chemistry, this refers to the irregular distribution of electrons in a molecule; polar molecules typically dissolve in water. * In genetics, this refers to the distinction between the 5' and 3' ends of nucleotide sequence s.

View web definitions »

Learn more about Polar »