Sex RatioF FactorSexConjugation, GeneticExtrachromosomal InheritanceBirth WeightAcridinesEscherichia coliGenetics, MicrobialColiphagesChromosomes, BacterialPremature BirthLactoseDNA, BacterialSex FactorsR FactorsBirth RateInfant, Low Birth WeightSex CharacteristicsRecombination, GeneticCrosses, GeneticGenesMutationLysogenyInfant, NewbornLactococcus lactisPregnancyDrug Resistance, MicrobialBirth OrderDNA, CircularBirth CertificatesPlasmids