Animals 6 Chromosome Pairing 6 Male 6 Meiosis 6 Synapsis animal 6 article 6 chromosome pairing 6 genetics 6 male 6 Recombination, Genetic 4 Spermatocytes 4 X Chromosome 4 X chromosome 4 genetic recombination 4 meiosis 4 metabolism 4 spermatocyte 4 BRCA1 protein 2 Caviomorpha 2 Cebidae 2 Cebus 2 Cebus paraguayanus 2 Cell Cycle Proteins 2 Chromosomal Proteins, Non-Histone 2 Chromosomes 2 Coreidae 2 Ctenomyidae 2 Ctenomys 2 Cucurbita 2