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

See 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 ?
ly sex factor beat The X hands down in the ek ratings.
Through an entertaining performance called The Sex Factor, actors from the Theatre and Learning company will teach pupils about how to stay safe, delaying sex until they are older, safe sex and where to go for help.
An interesting difference between the CKD-EPI and CAPA equations is that the CAPA equation does not require a sex factor.
Walter Quijano, "You have determined that the sex factor, that a male is more violent than a female because that's just the way it is, and that the race factor, black, increases the future dangerousness for various complicated reasons; is that correct?
Thus, we hypothesized that the relationship between sexual sensation seeking and the use of aggression to obtain unprotected sex would be mediated by the impersonal sex factor of number of sex partners.
On being probed further for the reason for their dislike he blamed it on the sex factor, claiming that Abdul wanted him.
Entitled Trapped, The Sex Factor, K/Chronos and Properganda, the presentations are inspired by students' studies of dramatists and real-life stories, current consumer tendencies, concepts on madness and media pressure.
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.
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.
THE SEX FACTOR Stunning dance teacher Chloe strikes a glamorous pose