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  Home >> Molecular Biology Dictionary >> Flag Affinity Tag - Foot Candle

Fitness
The number of offspring left by an in individual, often compared with the average of the population or with some other standard, such as the number of offspring left by a particular genotype fixation An event that occurs when all the alleles at a except one are eliminated from a population. The remaining allele, now occurring with a frequency of 100%, is said to have been fixed.

FLAG
See affinity tag.

Follicle stimulating hormone
(FSH) A hormone, secreted by the anterior pituitary gland in mammals, that stimulates, in female mammals, ripening ofspecialized structures in the ovary (Graafian follicles) that produce ova and, in males, the formation of sperm in the testis. It is a major constituent of fertility drugs.

Foot-candle
An obsolete photometric measure of light intensity. Now superseded by the lux (symbol: lx) (1 fc >> 10.7 lx). See lux; photon.

Flagellum
(pl: flagella; adj: flagellate) A whiplike organelle of locomotion in certain cells; locomotor structures in flagellate protozoa.

Flanking region
The DNA sequences extending either side of a specific sequence.

Fluorescence in situ hybridization
(FISH) Hybridization of cloned DNA to intact chromosomes, where the cloned DNA has been labelled with a fluorescent dye. This is the major method of physical mapping of cloned DNA fragments on chromosomes.

Fluorescence-activated cell sorting
(FACS) The use of laser beams to detect differences fluorescence between different types of cells in a mixture, the subsequent deflection of cell into separate bins corresponding to each type of cell in e mixture. One of the popular uses of this technology is in sperm sexing (q.v.).

Fluorescent probe
Probe whose response is based on the  fluorescence intensity of individual cells or cell components.

Flow cytometry
A technique used to sort cells or other biological material by means of flow through apertures of defined size or by laser sorting.

Flower
The structure in angiosperms (flowering plants) that bears the
organs for sexual reproduction.

Flus  end
See blunt end.

Flush-end cut
See blunt end cut.

Foetus
Pre-natal stage of a viviparous animal, between the embryonic stage and parturition.

Follicle
Any enclosing cluster of cells that protects and nourishes a cell or structure within. Thus a follicle in the ovary contains a developing egg cell, while a hair follicle envelops the root of hair.

Fold back
The structure formed when a double stranded DNA molecule containing an inverted repeat sequence is denatured and then allowed tore anneal at low DNA concentrations. The repeated sequence permits the formation of a double stranded region within each of the separated strands of the original molecule. folded genome The condensed intracellular state of the DNA in the nucleoid of a bacterium. The DNA is segregated into domains, and each domain is independently negatively supercoiled.

 

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