* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Reproduce It has the ability to produce offsprings by means of
Survey
Document related concepts
Tissue engineering wikipedia , lookup
Extracellular matrix wikipedia , lookup
Biochemical switches in the cell cycle wikipedia , lookup
Endomembrane system wikipedia , lookup
Cell encapsulation wikipedia , lookup
Cell nucleus wikipedia , lookup
Cellular differentiation wikipedia , lookup
Cell culture wikipedia , lookup
Cytokinesis wikipedia , lookup
Organ-on-a-chip wikipedia , lookup
Cell growth wikipedia , lookup
Transcript
Reproduce It has the ability to produce offsprings by means of sexual and asexual reproduction. The former type is observed only under unfavorable environmental conditions; whereas asexual reproduction is predominant in all paramecium strains. Read the following information for better understanding of asexual and sexual reproduction in paramecium: Asexual Reproduction The type of asexual reproduction exhibited by paramecium is called binary fission. Over here, a single cell divides into two equal halves, each of which becomes a separate paramecium cell. To be more precise, a paramecium cell consists of two nuclei - micronucleus (small) and macronucleus (large). The smaller nucleus serves as the signaling organelle for asexual reproduction in paramecium. When the environmental conditions are favorable, the smaller nucleus divides into two. These nuclei moves to either end of the cell. Following movement of the small nuclei to the opposite poles, the larger nucleus divides into two. After this, the cell divides transversely in the middle. The final outcome is two similar paramecium offsprings, each having half of the cell organelles of the parent cell. Know more on organisms that reproduce asexually. Sexual Reproduction As mentioned already, paramecium occasionally reproduces by sexual means, particularly when the cell is exposed to stressful conditions. For this process to take place, two paramecium cells should come together. When this happens, the cells align side by side and remain attached to each other. The micronucleus in each of the fused cells divide by meiosis, leading to formation of four haploid nuclei. Out of these, 3 are aborted and only one survives in each cell. The surviving micronucleus again divides mitotically and forms two nuclei. The two paramecium cells exchange one haploid micronucleus and they separate. It is the meiosis division that leads to exchange of genetic material. This sexual reproduction in paramecium is known as conjugation. There is no specific paramecium reproduction cycle as such. In favorable conditions, paramecium can undergo asexual multiplication for at least three times a day. Besides increased rate of multiplication, some paramecium strains form symbiotic association with bacteria and algae, which again enhances the survival rate. The algal component provides food to host paramecium by undergoing photosynthesis. While in case of bacterial symbiont, it releases toxic substances that kill prospective preys. Paramecium reproduces through mitosis, since it is a single celled Eukaryote. I suppose it is not called "mitosis," but rather "asexual reproduction," but it uses the same processes. Rate This Answer Reproduce