Gene Mapping in Ascospore Sordaria Cultures by Recombination Abstract The laboratory experiment demonstrates the process of meiosis using the Sordaria Fimicola fungi. Meiosis is important because it is the process that generates diversity in genetics. A wildtype was crossed with two mutant types: tan and grey. In order to exhibit recombination‚ the sequence of ascospores needed to result in a 2:2:2:2 or 2:4:2 sequence. From the crossover
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homologs‚ or a homologous pair. 3. Write out a general life cycle with arrows linking these terms: haploid (h)‚ diploid (2n)‚ meiosis‚ fertilization. Are the products of meiosis haploid or diploid? 4. Define sexual reproduction and asexual reproduction. How do they differ in comparing genetic traits between parent and offspring? At what points are mitosis and meiosis involved? Asexual Reproduction - The generation of offspring from a single parent that occurs without the fusion of gametes
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an ascomycete fungus that can be used to demonstrate the results of crossing over during meiosis. Sordaria is a haploid organism for most of its life cycle. It becomes diploid only when the fusion of the mycelia of two different strains results in the fusion of the two different types of haploid nuclei to form a diploid nucleus. The diploid nucleus must then undergo meiosis to resume its haploid state. Meiosis‚ followed by mitosis‚ in Sordaria results in the formation of eight haploid ascospores contained
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The lab experiment examined meiosis and genetic diversity through the model organism‚ Sordaria fimicola. Meiosis is part of the sexual life cycle and occurs in all sexually reproducing organisms. It is a method of cell division that produces gametes. Meiosis has two parts: meiosis I and meiosis II. Both parts undergo the same four stages of prophase‚ metaphase‚ anaphase‚ and telaphase. The process begins with one single parent diploid cell (that contain homologous chromosomes) that divides into
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4.1.1 State that eukaryote chromosomes are made of DNA and proteins.(1) State means to give a specific name‚ value or other brief answer without explanation or calculation. The chromosome is composed of two main molecules. a) DNA b) Proteins called histones. This image was taken shortly after DNA a replication but before the prophase. It is composed of two daughter chromatids joined at the centromere. The chromosome is super coiled by a factor around x16‚000. The DNA molecule is about 1
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formation‚ Fragmentation/Regeneration‚ Vegetative propagation 3. What are two types of sexual reproduction? (2pts) Meiosis‚ Conjugation 4. What types of cells are produced through mitosis? Meiosis? (2pts) Body Cells 5. How many divisions are there in mitosis? Meiosis? (2pts) one 6. Cells produced through mitosis are genetically identical daughter cells‚ whereas cells produced through meiosis are genetically four genetically different gamete cells. (2pts) 7. Describe the process of binary fission.
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It is important that cells go through mitosis because it makes each new cell contain the same gentic information. If meiosis did not occur the reproduction would cease to exist. Mitosis is the process of chromosomes dividing. There are four steps that it goes through. Between cell division the cells are in interphase. During this there is cell growth and the genetic material such as DNA is contained in the chromosomes‚ duplicated so that when the cell divides each new cell has a full version of
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[1] The term is sometimes used inaccurately to describe reproduction modes in hermaphroditic species that can reproduce by themselves because they contain reproductive organs of both sexes in a single individual’s body. Normal egg cells form after meiosis and are haploid‚ with half as many chromosomes as their mother’s body cells. Haploid individuals‚ however‚ are usually non-viable‚ and parthenogenetic offspring usually have the diploid chromosome number. Depending on the mechanism involved in restoring
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female gametes. Meiosis is the process where a diploid cell is divided into four daughter cells and is the process that helps with genetic diversity. There is meiosis 1 which is where no chromatids are copied and only one copy is given to each daughter cell and then meiosis 2 the chromatids separate and given to each gamete. During meiosis chromatids may cross over resulting in the recombination of segments causing genetic diversity of genes because they intermix from each parent. Meiosis helps ensure
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Meiosis is the type of nuclear division that occurs to form four genetically different gametes. This produces genetically different offspring which all differ in traits‚ the reason this occurs is because of the way that the chromosomes are handled to make gametes. The general gist of meiosis is that a homologous pair is split twice to make four separate cells that have the haploid number of chromosomes meaning when they fuse with other gametes they form a zygote with the diploid number of chromosomes
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