the chromosome gene - The unit of DNA along a chromosome that codes for a single characteristic‚ unit of dna that codes for a specific polypeptide synapsis - Pairing of homologous chromosomes called cross-over - The exchange or mixing of similar genetic material (genes) is called chiasmata - There is a criss-crossing of the non-sister chromatids called gene – unit of dna that codes for a specific polyeptide or characteristic karyotype - A display of metaphase chromosomes in which
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Crossing over- The two chromosomes making up a homolog pair are not genetically identical because homologs are inherited from different parents. When the chromosomes synapse during prophase 1‚ each gene in each chromosome is brought into contact with the same gene on that chromosome’s homolog. During this process of synapses the two chromosomes of each homolog pair exchange segments of DNA in a process called crossing over. The gene combinations on a chromosome can be changed. For example‚ suppose
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components of eukaryotic chromosomes and sister chromatids. Describe the phases of the eukaryotic cell cycle. Describe the events that take place during interphase. Summarize events that occur during the five phases of mitosis. Compare cytokinesis in plants and animals. Understand the function of meiosis in sexual reproduction. Distinguish between germ-line and somatic cells. Describe how homologous chromosomes pair during meiosis. Describe the behavior of chromosomes through both meiotic divisions
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1 – Mitosis and Meiosis 1. A certain species has three pairs of chromosomes: an acrocentric pair‚ a metacentric pair‚ and a telocentric pair. Draw a cell of this species as it would appear in metaphase of mitosis. (BAP 2.18) 2. A cell in G1 of interphase has 12 chromosomes. How many chromosomes and DNA molecules will be found per cell when this original cell progresses to the following stages? (BAP 2.20) a) G2 of interphase b) Metaphase I of meiosis c) Prophase of mitosis d) Anaphase I of meiosis
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Application of Molecular Techniques for Detection of Disease Resistant Genes in Tomato Breeding Lines for Guatemala Objectives: 1. Evaluate and modify methods for detection of Fusarium Race 2 resistance gene. 2. Evaluation of two step protocol for detection of Mi-1 gene. 3. Verification of marker for Ty-1 and evaluation for marker in Guatemala breeding lines. (This is a Geminivirus that is transmitted by the whitefly) 4. Use of molecular markers to detect geminivirus resistance source for Gu143
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A Semi-Detailed Lesson Plan in BIOLOGY Date: January 22‚ 2013 Time: 7:30-8:30 Section: BSEd-2B I. Objective(s) At the end of the 60-minute period‚ at least 75% of the student’s should be able to: 1. Differentiate prokaryotic from eukaryotic cells. II. Subject Matter a. Topic: Prokaryotes and Eukaryotes b. References: b.1. Department of Education. 2002. Operations Handbook in Biology: 2002 Basic Education Curriculum Secondary Level. II. 1. 1.4. b.2. Department of Education
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of the cell and follows immediately after mitosis. During mitosis‚ replicated chromosomes within the cell are separated into two identical sets. Each of the two new nuclei has a full set of chromosomes containing a copy of all the genetic material for the organism. Mind that only eukaryotic cells go through this process; prokaryotic cells lack a nucleus so they undergo binary fission in order to replicate their chromosome. Interphase basically starts off the cell cycle. Stages in interphase are G1
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Sickle-Cell Disease Discovery: http://www.sicklecellanaemia.org/sickle-cell-disease/discovery-of-sickle-cell-disease James Herrick was a doctor in Chicago‚ USA‚ and wrote about his observations of a patient with severe anaemia. When blood samples were viewed under the microscope Herrick noted “peculiar elongated and sickle-shaped red blood corpuscles”. Symptoms: http://www.nhlbi.nih.gov/health/health-topics/topics/sca/ Sickle cell anemia varies from person to person. Some people who have
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BIO 341 Homework #2 Questions: 1. A chromosome about to start mitosis is made of two sister chromatids. In what stage of the cell cycle were those sister chromatids made? When do they become visible and distinguishable by light microscopy? 2. For each of the events in mitotic phase‚ give the stage of mitotic phase in which it occurs The nuclear membrane breaks down during _______________________. Chromosomes have reached the equator of the cell during _______________________. The connection
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Africa. Spencer Wells quest to find the genetic marker to link ancestors over 60‚000 years ago is done by taking blood samples from hundreds of men on the migration route. Women were not sampled because the X chromosome evolves‚ thus only the Y chromosome could be used. I was astonished by the process used to retrieve DNA from blood that Wells shows the viewers. In the hundreds of samples of blood taken‚ Spencer Wells scouts for a certain feature in a DNA strand and finds
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