espèce (1) plomb (1) Deletion (1) Variation (1) Genes (1) X chromosome (1) Species (1) Segregation (1) Process (Law) (1) Meiosis (1) Males (1) Lead (1) Example (1) Discrimination (1) Crosses (1) Chromosomes (1) Caenorhabditis elegans (1) Caenorhabditis (1) Organisms (1) Sizes (1) Size (1)