遗传学名词解释F.doc
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F
F+ cell ?? -- A bacterial cell having a fertility (F) factor. Acts as a donor in bacterial conjugation.
F- cell ?? -- A bacterial cell that does not contain a fertility (F) factor. Acts as a recipient in bacterial conjugation.
F factor ?? -- An episome in bacterial cells that confers the ability to act as a donor in conjugation.
F factor ?? -- A fertility (F) factor that contains a portion of the bacterial chromosome.
F1 generation ?? -- First filial generation; the progeny resulting from the first cross in a series.
F2 generation ?? -- Second filial generation; the progeny resulting from a cross of the F1 generation.
F pilus ?? -- See pilus.
facultative heterochromatin ?? -- A chromosome or chromosome region that becomes heterochromatic only under certain conditions, e.g., the mammalian X chromosome.
familial trait ?? -- A trait transmitted through and expressed by members of a family.
fate map ?? -- A diagram or map of an embryo showing the location of cells whose development fate is known.
fertility (F) factor ?? -- See F factor.
filial generations ?? -- See F1 and F2 generations.
fingerprint ?? -- The pattern of ridges and whorls on the tip of a finger. The pattern obtained by enzymatically cleaving a protein or nucleic acid and subjecting the digest to two-dimensional chromatography or electrophoresis.
FISH ?? -- See fluorescence in situ hybridization.
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fitness ?? -- A measure of the relative survival and reproductive success of a given individual or genotype.
fixation ?? -- In population genetics, a condition in which all members of a population are homozygous for a given allele.
fluctuation test ?? -- A statistical test developed by Salvadore Luria and Max Delbrück to determine whether bacterial mutations arise spontaneously or are produced in response to selective agents.
fluorescence in situ hybridization (FISH) ?? -- A method of in situ hybridization that utilizes probes labeled with a fluorescent tag, causing the site of hybridization to fluo
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