Left bundle branch block is a problem with the heartâs electrical wiring system. Your heart has 4 chambers. The 2 upper chambers are called atria, and the 2 lower chambers are called ventricles.
The process of sexual reproduction involves two parents, each contributing one gamete. Gametes are produced. by a process called meiosis, which starts by the duplication of the chromosomes, followed by two rounds of cell divisions and halving of the chromosome number.Gametes have half the chromosome number of other adult. cells of an organism.A key feature of meiosis is the exchange of chromosome pieces which occurs in the first division of this process, called recombination or crossing over.ametes have half the chromosome number of other adult. cells of an organism. A key feature of meiosis is the exchange of chromosome pieces which occurs in the first division of this process, called recombination or crossing over.
The process by which cells and organisms produce other cells and organisms of the same kind. Cell reproduction usually involves division of a cell into two identical parts by means of mitosis or into four different parts by meiosis. â¦ The reproduction of organisms by the union of male and female reproductive cells (gametes) is called sexual reproduction. Most multicellular animals reproduce sexually. â¦ Reproduction in which offspring are produced by a single parent, without the union of reproductive cells, is called asexual reproduction. The fission (splitting) of bacterial cells is a form of asexual reproduction.