must be decondesed to appear in the form of chromatin and that too in form of euchromatin if DNA remained organized in the sense that they would not be accessible for transcription. Before the chromosomes condense the nuclear membrane goes through meiosis which is cell division between and egg and sperm cell that determines the sex of a baby. The sex is found by the sperm which carries a X and Y sex chromosomes. Before the cell divides two sets of chromosomes pair together and swap segments. The second
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The discovery of DNA is attributed to the research of three scientists in 1951; Francis Crick‚ Maurice Wilkins‚ and James Dewey Watson. They were all later accredited with the Nobel Prize in physiology and medicine in 1962. Thanks to their discovery‚ science has been able to research and learn from DNA blueprints and use recombinant DNA technology to discover answers‚ vaccines and build immunity for many viruses. In recent years science has been using this new technology to genetically modify animals
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types of fungi reproduction. A: (See below) 1. Fragmentation of the hyphae or mycelium. (Asexual) 2. Formation of conidiospores or sporangiospores. (Asexual) 3. Formation of gametes‚ which fuse to produce diploid zygotes. The zygotes undergo meiosis to produce haploid spores that grow back into the fungal hyphae. Q: List the types of specialized hyphae. A: Sporangiophores‚ rhizoids‚ and stolons. Q: How do most fungi reproduce? What are the mating types called? A: Asexually or sexually
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Midterm 1 stuff (1‚ 25‚ 26‚ 27‚ 28) 2) What characterizes a prokaryotic cell? a. the lack of ribosomes b. the lack of a membrane-enclosed nucleus c. the presence of a nucleus with no DNA d. the presence of mitochondria e. having a cell wall without a cell membrane 3) Which of the following does NOT comprise a logical hierarchy of organization? a. family‚ order‚ class‚ phylum‚ kingdom b. molecules‚ cells‚ tissues‚ organ systems‚ populations c. organisms‚ populations‚ communities‚ biomes
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at least 3 million of these cells begin to undergo meiosis‚ where the number of doubled chromosomes is reduced in half by dividing the cell over and over again. In order for the first phase of Meiosis to begin‚ the cell must become a primary spermatocyte. After this has occurred‚ the diploid cell‚ which has 46 chromosomes‚ split into two haploid secondary spermatocytes‚ each containing only 23 chromosomes. In the next phase of Meiosis‚ Meiosis II‚ the two cells split‚ again‚ forming four cells
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Mendelian inheritance Mendelian inheritance (or Mendelian genetics or Mendelism or Monogenetic inheritance) is a scientific theory of how hereditary characteristics are passed from parent organisms to their offspring; it underlies much of genetics. This theoretical framework was initially derived from the work of Gregor Johann Mendel published in 1865 and 1866 which was re-discovered in 1900; it was initially very controversial. When Mendel’s theories were integrated with the chromosome theory of
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Nabila Anika • Vascular plants-plants with vascular tissue; pteridophytes‚ gymnosperms‚ and angiosperms; includes all modern species except the mosses and their relatives • Vascular tissue-plant tissue consisting of cells joined into tubes that transport water and nutrients throughout the plant body • Pteridophytes-seedless plants with true roots and lignified vascular tissue; ferns‚ horsetails‚ and whisk ferns • Bryophytes-nonvascular plants; lack water conducting tissues and
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each process? Microsporogenesis produces our microspores. It occurs in the sporangia of the anther in flowers. Four haploid microspores are produced when the mother cell undergoes meiosis. Each microspore develops into a pollen grain. Megasporogenesis occurs in the sporangium of the ovule of a flower. After meiosis‚ the embryo sac is produced (egg‚ nucei‚ antipodal cells‚ synergids). 3. Draw and label all parts of a complete flower. Indicate the functions of the major parts.
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Diversity of Photosynthetic Organisms Observation of marine and fresh water algae Identification of lichens Study of leaf tissue cells Quiz next week. Feb. 17 President’s Day Feb. 20 Lab 5 The Cell Cycle: Mitosis – simple cell division Meiosis – formation of reproductive cells. Individual labeled diagrams due at end of lab. Feb. 24/27 Lab 10 Responsiveness and Behavior Experimentation of human senses: touch‚ taste‚ smell‚ hearing and vision. Lab reports due next week. March
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Mutation Variation of organisms occurs from linkages and crossing over. The Independent Assortment of Random Fusion of gametes also creates variation. Mutation will occur and new gametes or alter existing ones. What is mutation? Mutation is a permanent alteration of a genomic sequence. It may be divided into two categories: 1) Point/ Gene Mutation 2) Chromosomal Mutation Mutations may either be advantageous or disadvantageous and are not all inherently negative Point/ Gene Mutation
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