NATS 1690 Lecture Notes - Lecture 29: Mendelian Inheritance, Ploidy, Meiosis
1 Apr 2016
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Meiosis = most variaion that arises each generaion during sexual reproducion. Reshuling events: crossing over, random posiioning, nature of ferilizaion. Meiosis -> two cell divisions that results into four haploid gametes: haploid: single or unpaired chromosome. New combinaions of traits among ofspring: crossing over, independent assortment (random segregaion) Failure of chromosomes to separate during meiosis creates cells with extra or missing chromosomes. Meiosis divides the chromosomes number in half: germ cell 2 diploid (1 diploid = two chromosomes, one from each parents) Found in golands (found in ovaries in females, and testes in males) In these organs, golands makes eggs in females, and sperm in males called gametes. Formed by mitosis: gametes haploid (sperm and egg) Union of gametes restores diploid number in zygote. Meiosis has two cell divisions which results into 4 haploid daughter cells. Interphase (2n): the dna in the cell is copied resuling in two idenical full sets of chromosomes.
