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The restriction point, during which the DNA is checked for quality, must be passed for the cell to move into the S stage. The strands of DNA, called chromatids, are held together at the centromere.
o In the G2 stage (postsynthetic gap), there is further cell growth and replication of organelles in preparation for mitosis.
· Mitosis produces two genetically identical diploid daughter cells from a single cell and occurs in somatic cells.
· Mitosis has four phases: o In prophase, the chromosomes condense, nuclear membrane dissolves, nucleoli disappear, centrioles migrate to opposite sides of the cell, and the spindle apparatus begins to form.
· Cyclins and cyclin-dependent kinases (CDK) rise and fall during the cell cycle.
Cyclins bind to CDKs, phosphorylating and activating transcription factors for the next stage of the cell cycle.Practice lab practical on the reproductive system medullary ap biology 2004-2005 lab 4: photosynthesis essay 2004 (part 1) a controlled experiment was.For students taking the ap biology test this may, ltp is offering a content covered: heredity, evolutionary biology, cell reproduction/division, mitosis and.The development of another human is a humbling and inspiring process.Indeed, it is through the union of one egg and one sperm that every human being on the planet today—and since the beginning of the human race—came to be in existence.We first examined mitosis, which results in genetically identical diploid daughter cells.We then moved on to meiosis, which results in genetically nonidentical haploid daughter cells, or gametes.· Cancer occurs when cell cycle control becomes deranged, allowing damaged cells to undergo mitosis without regard to quality or quantity of the new cells produced.Cancerous cells may begin to produce factors that allow them to escape their site and invade or metastasize elsewhere.We then looked at the male and female reproductive systems, which form these gametes, each of which contains half of the normal complement of genetic information.Finally, we explored basic reproductive endocrinology and saw how testosterone and estrogen are key for development of the reproductive systems and the secondary sex characteristics that develop at puberty.