sex factor


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F plas·mid

the prototype conjugative plasmid associated with conjugation in the K-12 strain of Escherichia coli.

sex factor

n.
A bacterial plasmid that enables one bacterium to donate its genetic material to another bacterium by conjugation, resulting in genetic recombination. Also called fertility factor, f factor.

sex factor

HOMOGAMETIC SEX. In humans the male is heterogametic, sex being determined by the presence of a Y-chromosome rather than the presence of two X-chromosomes (see KLINEFELTERS'S SYNDROME and TURNER'S SYNDROME). In birds, reptiles, some amphibia and lepidopterans, the situation is reversed, with females being the heterogametic sex. In fruit flies, sex is determined by the ratio of the number of X-chromosomes to the number of sets of autosomes (A). When the ratio of X/A = 1.0 the individual is female, when X/A = 0.5 a male results. In other DIPTERANS such as the yellow-fever mosquito, sex is determined by a single locus with two alleles, the heterozygote being the male (M/m) and a homozygote the female (mm). Plants too can have XX, XY sex determination where they are DIOECIOUS, but various other mechanisms also can occur. For example, sex in asparagus is controlled by a single pair of alleles, with maleness dominant.

sex factor

see F FACTOR.
References in periodicals archive ?
Second, we hypothesized that impersonal sex factors, such as inconsistent condom use and more sex partners, would directly predict use of aggression and coercion to avoid condom use and would also correlate with each other, consistent with prior research (Peterson et al., 2010).
Sorry to come over all Mary Whitehouse, but for a prewatershed programme supposedly suitable for family viewing, it veered dangerously close to porno - more Sex Factor than X Factor.
SEX FACTOR: Cheryl Cole performing on the main stage at the Radio 1 Big Weekend at Faenol Estate in Bangor, North Wales HAVING THE FEST TIME: Fans enjoying the Big Weekend GREAT START: Jared Leto from 30 Seconds From Mars
Chief Inspector David Lyle, of Lothian and Borders Police, is competing in the Sex Factor 2008 contest, hosted by online dating and networking site Gaydar.
The 27-year-old has attempted to `up' the sex factor in the fly-on-the-wall house during her final days, by disclosing she once had a threesome, performing a raunchy dance with Tania and spending hours lounging around in a bikini.
Laura Riding's was titled, 'The Sex Factor in Social Progress', and is included in this book.
Furthermore, all of the two-way interactions, including the sex factor, were not significant (all p > 0.1) and all other two-way interaction effects, that is, age and % MVC, joint angles and % MVC, and age and joint angles, were significant (all p < 0.001).
The new internet series "(http://sexfactor.com/) Sex Factor ,"&nbsp;which premieres Thursday on the adult streaming video site xHamster, is another show in the now-venerable genre featuring a group of reasonably attractive young people living in a house with the unstated purpose of getting them to cavort and mingle.
Considered as an outcome variable, body weight were predicted from explanatory variables, linear body measurements; namely, body length (BL), withers height (WH), chest girth (CG), paunch girth (PG), face length (FL), length between ears (LBE), length of ears (EARL), width (FTW) and length (FTL) of tail, and sex factor.
The Strictly sex factor beat The X Factor jazz hands down in the opening week ratings.
Maybe two of them can couple up for a Sex Factor spin-off ?
over X Factor, when it comes to Kylie Minogue read Sex MOVE over X Factor, when it comes to Kylie Minogue read Sex Factor.