Protist2 - micronucleus is involved in inheritance of...

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Protista Ciliates Ciliates move by means of rows of cilia. These hair-like structures are connected at their bases to a system of contractile fibers similar to a muscular system in higher animals. This allows the cilia to beat in a given pattern, either to move the cell or to wash food particles toward a primitive mouth. A Typical Ciliate: The Paramecium Figure%: Structure of the Paramecium The structure of the paramecium is shown in the figure above. The cell membrane is covered with rows of cilia that beat rhythmically to wash food toward the oral groove where it will be packaged in special food vacuoles for digestion. Like all ciliates, and unlike any other group of protozoa, the paramecium has two types of nuclei. The macronucleus maintains cell growth and function by producing messenger RNA and can have hundreds of copies of the cell's DNA. The
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Unformatted text preview: micronucleus is involved in inheritance of genetic material during sexual reproduction and is only diploid. Sexual reproduction takes place through a process called conjugation. When individuals of opposite mating types meet, the adhere to each other at the oral groove. The micronuclei then divide meiotically , producing four haploid nuclei each. All but one nucleus from each paramecium disintegrate. The macronucleus also disintegrates, leaving each cell with one haploid micronucleus. These remaining nuclei then divide mitotically and the two cells swap copies of their nuclei. The cells separate and the haploid nuclei fuse, leaving each cell with a new diploid micronucleus. To form a new macronucleus, the micronucleus divides several times and the resulting nuclei develop into a macronucleus....
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This note was uploaded on 01/27/2012 for the course BIOLOGY BSC1005 taught by Professor Rodriguez during the Winter '09 term at Broward College.

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Protist2 - micronucleus is involved in inheritance of...

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