In a sexual reproduction dna from the parent cell. Before it produces daughter cells. Coils up,produces cytoplasm,moves towards one pole,replicates
Sexual reproduction involves the combination of DNA from two different parent cells to form offspring. The process you are describing sounds like a mix of cell division and the preparation of cells for sexual reproduction. Let's clarify the steps involved:
1. **Coiling Up**: Within a cell, before division, the DNA, which is normally in a less condensed form called chromatin, coils up into more tightly packed structures called chromosomes. This process is necessary for the chromosomes to be organized and separated properly during cell division.
2. **DNA Replication**: Before a parent cell divides, it replicates its DNA so that each daughter cell will have a complete copy of the genetic information. This happens during the S phase of the cell cycle for both somatic cells (mitosis) and germ cells (meiosis). In sexual reproduction, it's the meiosis that leads to the production of gametes (sperm and eggs).
3. **Production of Cytoplasm**: As the cell prepares to divide, it increases the production of cytoplasm and other necessary cellular components to ensure that the daughter cells will have the necessary cellular machinery and volume to function after division.
4. **Moving towards one pole**: During cell division, the replicated chromosomes are aligned at the cell's equator (metaphase) and then separated with each new set moving towards opposite poles of the cell (anaphase). In mitosis, this results in two genetically identical daughter cells, whereas in meiosis, it is part of the process that results in four genetically distinct gametes with half the DNA content of the parent cell.
5. **Sexual Reproduction (Fertilization)**: Meiosis results in the production of gametes, which are haploid cells containing one set of chromosomes (in humans, 23 chromosomes). When a sperm cell (male gamete) fuses with an egg cell (female gamete), the process is called fertilization. The resulting zygote has two sets of chromosomes (in humans, 46 chromosomes), one from each parent, and will undergo cell division and differentiation to develop into a new organism.
So to summarize, the cell cycle for sexual reproduction involves DNA replication, condensation of DNA into chromosomes, distribution of chromosomes to new cells during cell division (mitosis or meiosis), and the eventual combination of the genetic material from two parent cells during fertilization to create a zygote.