BIO 105 Lecture Notes - Lecture 5: Apoptosis, Centriole, Cerebrospinal Fluid
11 Apr 2017
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Document Summary
Apoptosis, or cell death, carves out distinctive structures. A receptor on the cell membrane receives a signal to die. Proteins within the cell begin to dismantle a cell. Mitotic cell divisions allow an organism to grow and develop, repair tissues, and regenerate lost body parts. Chromosomes are not organelles, essentially nothing but dna. Centriole grabs the chromosomes and starts to line them up. Mitosis adds new cells while apoptosis removes them, allowing tissues to renew themselves. Reproduction occurs in two main forms: asexual and sexual. Sexual production = more dna mixing and variability. Variability is important in a population because it allows for that population to have more morphologies in order to adapt to things in a ecosystem. Dna replicates once, but the nucleus divides twice. Each individual cell only has half of the dna strand in it. During crossing over, two homologous chromosomes exchange genetic material during prophase i. In independent assortment, chromosome pairs align randomly during metaphase i.
