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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Another major difference is that the modern ballad‚ "There You’ll Be" is much longer than the older ballad. There are many words and phrases in S. Foster’s ballad that we don’t usually use in our common literature. For example‚ "many were the blithe birds that warbled them o’er‚" to translate this to the people that don’t speak with these different words; it says‚ "many were the cheerful birds that chirped them over." As you can see so far‚ there are many differences in the way that these two songs‚ otherwise
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There are many differences in the composition and storage of genetic material in prokaryotes and eukaryotes. Chromosomes in prokaryotes consist of a single nucleic acid molecule which can be either DNA or RNA. There is comparatively little genetic material for example E.coli genome is 1200 micrometres while a single human chromosome is between 12000 and 73000 micrometers in size. Unlike in eukaryotes the genetic material in viral prokaryotes can be single or double stranded RNA or DNA. It can also
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Meiosis I Prophase I: - nuclear membrane dissolves * centrioles move to poles * spindle fibres forming * DNA has been replicated and forms chromosomes made of 2 identical chromatids * Homologous chromosomes line up to form a bivalent‚ 2 chromosomes or 4 chromatids (TETRAD)‚ this process is called SYNAPSIS * Where chromatids overlap is called a CHIASMATA‚ and it allows for CROSSING OVER of genetic information between chromosomes Metaphase I: - homologous chromosomes
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Introduction: Mitosis occurs in all eukaryotic cell tissues and produces genetically identical daughter cells with a complete set of chromosomes. In humans‚ mitosis produces somatic cells that are diploid‚ which means they contain two non-identical copies of each of the twenty-three chromosomes. One copy is derived from the person’s mother and the other from the person’s father. Meiosis‚ on the other hand‚ occurs only in testis and ovary tissues‚ producing sperm and ova (eggs). The gametes that
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Lab #3: Mitosis and Meiosis To investigate the processes of mitosis and meiosis. Cells come from previous existing cells. New cells are formed by cell division‚ which involves karyokinesis and cytokinesis. Karyokinesis is the division of the cell’s nucleus and cytokinesis is the division of the cytoplasm. Mitosis and meiosis are the two types of nuclear division. Mitosis results in body cells: the formation of an adult organism from a fertilized egg‚ regeneration‚ asexual reproduction‚
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Growth‚ repair and reproduction. • Growth: This is a result of mitosis. The more cells in an organism‚ the larger that organism is. Humans start off as one single cell‚ and by the time they are adults‚ they have over 10 trillion cells!!! This increase in the number of cells also allows for some of those cells to be specialized for various functions. This is important to the survival of many organisms. • Repair: This is a result of mitosis. If tissue is damaged‚ repair is extremely important. With
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The differences between two cultures There are so many countries in the world. As my grandmother taught me that each country has its own tradition and culture for example Japanese has kimono for its special festival‚ Kungfu is significant symbol of China or Pizza and Spaghetti are the characteristic food of Italia. Therefore when I came to America‚ I decided to search everything about this country. Then after 5 months in there‚ I found that Vietnam and The USA are very different from living style
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early in their existence because of all the dissimilarities between the two groups. Both bacteria and archaea are enclosed in cell membranes. Archaea have a single cell membrane that absences a peptidoglycan wall and also their genetic transcription and translation‚ the two main processes in molecular biology do not show the typical bacterial features‚ but are quite similar to those of eukaryotes. Archaea are more related to eukaryotes‚ even though eubacteria and archaea are prokaryotic groups. Bacteria
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Meiosis Worksheet On the lines provided‚ order the different stages of meiosis I THROUGH meiosis II‚ including interphase in the proper sequence. 1. 4th metaphase I homologous chromosome line up in the center of the cell 2.5th anaphase I spindle fibers pull homologous pairs to ends of the cell 3. 9th Telophase II 4 haploid (N) daughter cells form 4. 1st interphase cells undergo a round of DNA replication 5.7th anaphase II sister chromatids separate from each other 6. 6th Telophase I 2 haploid
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