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Lect+3.+6+slides+per+page

Lect+3.+6+slides+per+page - Lecture 3 Outline Biological...

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1 Biological Beginnings From Genes to Babies Lecture 3 Outline square6 Genes and environment square6 Prenatal development square6 Effects of the prenatal environment square6 Assessing and caring for babies at risk square6 Genotype square6 A particular set of genes a person inherits from his or her parents Genes and Environment square6 Phenotype square6 The visible expression of the genotype Chromosome: threadlike structure that contains the genetic information DNA: the genetic substance in chromosomes Genes: segments of DNA The Process of Genetic Transmission The Process of Genetic Transmission square6 Ovum square6 Largest human cell square6 The female germ cell (egg) square6 Sperm square6 Smallest human cell square6 The male germ cell The Process of Genetic Transmission Ovum and sperm Unite to form a single cell= the Zygote
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2 Genetic Influences on Development square6 A gene has 2 alleles square6 Allele=An alternate form of a gene ( A or a ) square6 One from the mother square6 One from the father square6 Alleles combination square6 Same alleles=homozygous ( AA, aa ) square6 Different alleles=heterozygous ( Aa, aA ) 1. Blend to form intermediate trait 2. Codominance: Both are simultaneously expressed 3. One dominant and one recessive Sickle-Cell Anemia Genetic Influences on Development square6 The sex chromosomes square6 Y chromosome does not have equivalent genes to match the X chromosome square6 Recessive X-linked genes will automatically be expressed in males square6 Recessive X-linked genes in female will be expressed only if the other X-chromosome has the recessive allele as well Genetic Influences on Development square6 Genetic disorders square6 Gene level square6
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