APchapter13notes - C hapte 13 note r s Me iosis and se xual...

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    Chapter 13 notes Meiosis and sexual lifecycle
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    An Introduction to Heredity Heredity : the transition of traits from one  generation to the next Along w/ similarities, there is also  variation-  offspring differ somewhat in  appearance from parents to offspring Genetics : the study of heredity and  hereditary variation
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    An Introduction to Heredity Parents pass information to offspring  through coded hereditary units called  genes . - 30 to 40 thousand genes in humans - genes are segments of DNA
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    Concept 13.1 Two types of reproduction : Asexual reproduction : single parent  passes copies of all its genes to  offspring; “like begets like.” Sexual reproduction : two parents give  rise to offspring; results in greater  variation
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    Concept 13.2 Life cycle : generation-to-generation  sequence of stages in the reproductive  history of an organism The human life cycle - each  somatic cell  has 46 chromosomes  (23 pair); 2 copies of each pair are  called  homologous chromosomes
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