during prophase 1 homologous chromosomes exchange segments of dna in a process that is part of a larger process called recombination.
during prophase 1 homologous chromosomes exchange segments of dna in a process that is part of a larger process called recombination.
during prophase 1 homologous chromosomes exchange segments of dna in a process that is part of a larger process called?
recombination
prophase i is typically the longest phase of meiosis. during prophase i, homologous chromosomes pair and exchange dna (homologous recombination). this often results in chromosomal crossover. this process is critical for pairing between homologous chromosomes and hence for accurate segregation of the chromosomes at the first meiosis division. the new combinations of dna created during crossover are a significant source of genetic variation, and result in new combinations of alleles, which may be beneficial. the paired and replicated chromosomes are called bivalents or tetrads, which have two chromosomes and four chromatids, with one chromosome coming from each parent. the process of pairing the homologous chromosomes is called synapsis. at this stage, non-sister chromatids may cross-over at points called chiasmata (plural; singular chiasma). prophase i has historically been divided into a series of substages which are named according to the appearance of chromosomes.
meiosis
prophase i is divided into five phases: leptotene, zygotene, pachytene, diplotene, and diakinesis. in addition to the events that occur in mitotic prophase, several crucial events occur within these phases such as pairing of homologous chromosomes and the reciprocal exchange of genetic material between these homologous chromosomes. prophase i occurs at different speeds dependent on species and sex. many species arrest meiosis in diplotene of prophase i until ovulation. in humans, decades can pass as oocytes remain arrested in prophase i only to quickly complete meiosis i prior to ovulation.









































section::::meiotic prophase.:prophase i.:leptotene.
prophase