The point where a crossover occurs is called a chiasma plural chiasmata see below figure. They can now be viewed underneath a light microscope. In humans, the haploid number of chromosomes is Each diploid cell has. The separated chromatids are now individual chromosomes. Reproduction is the key to the continued existence of our species.
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3.7 Brief summary

Each of these performs a specific function. Spermatogonia develop from primordial germ cells that migrate into the undifferentiated gonad early in embryogenesis. Chromosomes that have genes DNA instructions that determine the sex of an organism. Unlike in mitosis, the daughter cells produced during meiosis are genetically diverse. Haploid — Organism with only one copy of each gene in each cell, or gametes with such. The position of the centromere is readily observable in a human karyotype of homologous chromosomes. There is no replication of genetic material in this division, but the centromere divides so that a single-stranded chromatid goes to each cell.
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Homologous chromosomes quizlet

The pairing of homologous chromosomes is unique to meiosis. Chiasmata are thought to represent the process of crossing over, or recombination , in which an exchange of DNA between two of the four chromatids occurs. Structure Type of Organ Function Testis. The spindle disappears. Centromeres divide, separating the chromatids, which move to the opposite poles as chromosomes. Metaphase I: The chromosome pairs line up next to each other along the centre equator of the cell. The chromosome inherited from mom gets some of dads alleles.
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In the oviduct, hundreds of sperm reach the egg. A cell that is not dividing is said to be in interphase. By the end of metaphase I, all the fused sister chromatids are tethered at their centromeres and line up in the middle of the cell. The development of the testis occurs under the influence of testosterone among other factors. Actually, it is necessary for a lot of sperm to reach the egg because they release enzymes that allow penetration of a single sperm to effect fertilization. Sister chromatids contain the same genes ie: they code for the same proteins , whereas non sister chromatids do not.
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Sperm cells begin the process of meiosis they become

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