Abstract: A method for efficiently producing homozygous organisms from a heterozygous non-human starting organism, comprising providing of a heterozygous starting organism; allowing the starting organism to produce haploid cells; creating homozygous organisms from the haploid cells thus obtained; and selecting the organisms having the desired set of chromosomes; wherein during production of the haploid cells no recombination occurs in order to obtain a limited number of genetically different haploid cells. Recombination can also be prevented or suppressed.

Abstract: A method for efficiently producing homozygous organisms from a heterozygous non-human starting organism, comprising providing of a heterozygous starting organism; allowing the starting organism to produce haploid cells; creating homozygous organisms from the haploid cells thus obtained; and selecting the organisms having the desired set of chromosomes; wherein during production of the haploid cells no recombination occurs in order to obtain a limited number of genetically different haploid cells. Recombination can also be prevented or suppressed.

Abstract: A method for efficiently producing homozygous organisms from a heterozygous non-human starting organism, comprising providing of a heterozygous starting organism; allowing the starting organism to produce haploid cells; creating homozygous organisms from the haploid cells thus obtained; and selecting the organisms having the desired set of chromosomes, wherein during production of the haploid cells no recombination occurs in order to obtain a limited number of genetically different haploid cells. Recombination can also be prevented or suppressed.

Abstract: The present invention relates to a method for efficiently producing homozygous organisms from a heterozygous non-human starting organism, comprising providing of a heterozygous starting organism; allowing the starting organism to produce haploid cells; creating homozygous organisms from the haploid cells thus obtained; and selecting the organisms having the desired set of chromosomes; wherein during production of the haploid cells no recombination occurs in order to obtain a limited number of genetically different haploid cells. Recombination can also be prevented or suppressed.

Abstract: The present invention relates to a head-forming lettuce plant of the species Lactuca sativa having red leaves throughout the head, including the heart. The red leaves in the heart are red even in the absence of radiation with wavelengths shorter than 400 nm, wherein the absence of radiation with wavelengths shorter than 400 nm is in the growing environment during the complete period from sowing until observation. The ratio between anthocyanin and chlorophyll is between 4 and 50, preferably between 9 and 27. The invention also relates to progeny of the plant.

Abstract: A method for efficiently producing homozygous organisms from a heterozygous non-human starting organism, comprising providing of a heterozygous starting organism; allowing the starting organism to produce haploid cells; creating homozygous organisms from the haploid cells thus obtained; and selecting the organisms having the desired set of chromosomes, wherein during production of the haploid cells no recombination occurs in order to obtain a limited number of genetically different haploid cells. Recombination can also be prevented or suppressed.

Abstract: A method for efficiently producing homozygous organisms from a heterozygous non-human starting organism, comprising providing of a heterozygous starting organism; allowing the starting organism to produce haploid cells; creating homozygous organisms from the haploid cells thus obtained; and selecting the organisms having the desired set of chromosomes, wherein during production of the haploid cells no recombination occurs in order to obtain a limited number of genetically different haploid cells. Recombination can also be prevented or suppressed.

Abstract: The present invention relates to a head-forming lettuce plant of the species Lactuca sativa having red leaves throughout the head, including the heart. The red leaves in the heart are red even in the absence of radiation with wavelengths shorter than 400 nm, wherein the absence of radiation with wavelengths shorter than 400 nm is in the growing environment during the complete period from sowing until observation. The ratio between anthocyanin and chlorophyll is between 4 and 50, preferably between 9 and 27. The invention also relates to progeny of the plant.

Abstract: The present invention relates to a head-forming lettuce plant of the species Lactuca sativa having red leaves throughout the head, including the heart. The red leaves in the heart are red even in the absence of radiation with wavelengths shorter than 400 nm, wherein the absence of radiation with wavelengths shorter than 400 nm is in the growing environment during the complete period from sowing until observation. The ratio between anthocyanin and chlorophyll is between 4 and 50, preferably between 9 and 27. The invention also relates to progeny of the plant.

Abstract: A method for efficiently producing homozygous organisms from a heterozygous non-human starting organism, comprising providing of a heterozygous starting organism; allowing the starting organism to produce haploid cells; creating homozygous organisms from the haploid cells thus obtained; and selecting the organisms having the desired set of chromosomes, wherein during production of the haploid cells no recombination occurs in order to obtain a limited number of genetically different haploid cells. Recombination can also be prevented or suppressed.