biol lec 3

biol lec 3 - Plant life cycle Alternation of generations...

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Plant life cycle · Alternation of generations between diploid and haploid How accurate is meiosis? · Chromosomes abnormalities arise very frequently -sometimes cause by nondisjunction events · 17-20% of recognized pregnancies end in miscarriage · 60% of these have chromosomal abnormalities Meiosis in Humans · Males -each cell undergoing meiosis gives rise to 4 sperm cells · Females -each cell undergoing meiosis gives rise to 1 egg cell Primary oocyte (diploid)àmeiosis 1àsecondary oocyte + 1 st polar bodyàmeiosis 2 (happens mostly after fertilization)àegg (haploid) +2 nd polar body November 11, 2010 Chapter 11 Gregor Mendel and the basic principles of heredity Main points: · The field of genetics started with Gregor Mendel -what did he do? -why was he successful? · Mendel’s Law -principle of segregation -law of independent assortment · Some rules of Probability -addition rule -multiplication rule What is genetics? · The science of heredity · The study of the relationship between genotype and phenotype -genotype: complete genetic makeup of an organism -phenotype: appearance of characteristics of an organism -all measurable attributes
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This note was uploaded on 01/18/2012 for the course BIO 101 taught by Professor Martin during the Fall '08 term at Rutgers.

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biol lec 3 - Plant life cycle Alternation of generations...

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