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 s Genes and environment s Prenatal development s Effects of the prenatal environment s Assessing and caring for babies at risk s Genotype s A particular set of genes a person inherits from his or her parents Genes and Environment s Phenotype s 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 s Ovum s Largest human cell s The female germ cell (egg) s Sperm s Smallest human cell s 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 s A gene has 2 alleles s Allele=An alternate form of a gene ( A or a ) s One from the mother s One from the father s Alleles combination s Same alleles=homozygous ( AA, aa ) s 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 s The sex chromosomes s Y chromosome does not have equivalent genes to match the X chromosome s Recessive X-linked genes will automatically be expressed in males s Recessive X-linked genes in female will be expressed only if the other X-chromosome has the recessive allele as well
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This note was uploaded on 09/13/2010 for the course PSC 140 taught by Professor Lagatutta during the Fall '08 term at UC Davis.

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

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