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 ?
With an examination of the decision tree formed via exhaustive CHAID in visual form, the predominant factor most significantly affecting body weight was sex factor (F=673.
It should be noted that the sex factor of CKD-EPI did not contribute to decreased differences in performance between males and females.
Third, in accordance with the original model, we predicted that men who report a high degree of both negative attitudes toward women and impersonal sex factors would also report the greatest use of aggression and coercion to obtain unprotected sex.
Describing it as "a light-hearted bit of frivolous fun", Mr Lyle said he was pleased that someone had put him forward for the Sex Factor competition.
THE SEX FACTOR Stunning dance teacher Chloe strikes a glamorous pose
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.
X FACTOR hopeful Jay James fell for his wife after she impressed him with her sex factor on an adult TV show.
And please remember that you earn a crust on The Voice now, and not that tired out Sex Factor.
Nicole has been turning up the sex factor in a sultry photoshoot for Glamour magazine.
Award-winning TV writer Andrew Davis brought the sex factor to Pride And Prejudice in 1995 by putting Colin Firth in a wet shirt as a dashing Darcy.
On cross-examination, the prosecutor asked 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?