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Chapter 5 Notes 9-17-09 - Chapter 5 Nature Nurture Human...

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Chapter 5 Nature, Nurture, Human Development
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Genes and Heredity __Heredity__ : Based on biological transmission of traits from one generation to next. __Genetics___ : Is the branch of biology that studies heredity. __Chromosomes__ - Rod shaped structures composed of genes that are found within the nucleus of the cells. __Humans have 46 chromosomes_ - Each chromos contains thousands of genes
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Figure 5.1 Figure 5.1 Genes are sections of chromosomes in the nuclei of cells
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Segments within DNA consist of  genes  that make proteins to determine our  development. 
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TWINS TWINS : Twins are a form of multiple birth How are the twins forms? A zygote (zi-goat) (the single cell) divides into 2 cells Monozygotic , (mono-zie-got-ic) or identical, twins develop from a single fertilized egg and have identical genes. Dyzygotic , (Die-zee-got-ic) or fraternal, twins develop from two eggs and share only half of their genes Sex-linked genes The sex chromosomes determine whether an individual will become a male or female. There are two types of sex chromosomes, called X and Y. Females receive an X from each parent; males receive an x from mother and a Y from father
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Figure 5.12a Fetal alcohol syndrome FAS is characterized by stunted growth of the head and body, facial, cranial and ear malformations, neurological damage, learning disabilities, and mental retardation.
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