Bio in the Social Context Monday, Feb 15
Bio in the Social Context Monday, Feb 15 bio 254
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This 1 page Class Notes was uploaded by Gabi Reed on Monday February 15, 2016. The Class Notes belongs to bio 254 at Ball State University taught by Dr. Rogers in Spring 2016. Since its upload, it has received 29 views. For similar materials see Biology in the Social Context in Biology at Ball State University.
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Yes YES!! Thank you for these. I'm such a bad notetaker :/ will definitely be looking forward to these
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Date Created: 02/15/16
Meiosis- Making Gametes Ovum (egg) Sperm What if both have 46 Chromosomes The zygote (fertilized egg) would have 92 chromosomes… would abort. Meiosis reduces the chromosome number by half. 23 chromosomes in both sperm and egg So when sperm meets egg, the zygote will have 46. Cell in ovary or testi is normal, then they replicate chromosomes, there is a first cell division and then a second. The first has two sets, and the second has one. Gametes have one member of each pair of chromosomes. Human female forms one viable egg after meiosis. It is called an Oocyte while having two chromosomes. Polar body is the not-going-to- be-an-egg left over where the unequal division of the cytoplasm happened. When the Oocyte splits it gives another polar body and an ovum (egg). Polar bodies don’t leave the ovaries and cannot be fertilized. When Meiosis Goes Wrong Chromosomes Anomalies Trisomy (3 chromosomes/ set) Monosomy (1 chromosome/ set) Trisomy 21 is Down syndrome 25% of the time the sperm contributes the extra chromosome, 75% of the time it’s the egg Females can reproduce; males are sterile (have down syndrome) Nondisjunction, when meiosis goes wrong and the chromosomes stay in one new cell, rather than splitting and going one per cell.
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