Human Development 265, Week 4 Notes
Human Development 265, Week 4 Notes HD 265
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This 6 page Class Notes was uploaded by Erika De Leygraaf on Thursday September 29, 2016. The Class Notes belongs to HD 265 at University of Wisconsin - Stevens Point taught by Cuiting Li in Summer 2015. Since its upload, it has received 2 views. For similar materials see HUMAN GROWTH AND DEVELOPMENT: A LIFE-SPAN APPROACH in Human Development at University of Wisconsin - Stevens Point.
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Date Created: 09/29/16
9/27/16 What We Discussed: Chapters 3 & 4 Twins - Monozygotic Twins = made from one zygote, identical, exact same DNA - Dizygotic Twins = made from two zygotes, not identical but fraternal - In Vitro Fertilization = assisted reproduction - sperm and ovum are fused outside of the mother then placed inside - Epigenetics = theory about the interactions between genes and environment Chromosomal Abnormalities - When severe, cause spontaneous abortion - Mosaic = mixture between normal and abnormal cells - Down Syndrome → extra 21st chromosome - Turner Syndrome → only one 23rd chromosome (X) - Klinefelter’s Syndrome → three 23rd chromosomes (XXY) - Dominant Disorder → will always show in phenotype when carried - Recessive Disorder → needs two genes to show in phenotype Genetic Counseling - check for future genetic abnormalities - Parents, siblings, or children with genetic condition - History of spontaneous abortion, stillbirth, or infertility - Same ethnic group, subgroup or related - Women 35+ Zygote to Newborn - Stages/Periods - Germinal Period = 1st 2 weeks - Week 1 → zygote travels and begins to divide - Week 2 → cell differentiation, implantation occurs - Embryonic Period = 3rd-8th week - Week 3 → nodule cord develops (will become the nervous system) - Week 4 → eyes, ears, nose, mouth and cardiovascular system form - Week 5 → limbs start to form (arms, legs, hands, feet, fingers, and toes) - Fetal Period = 9th week to birth - Week 12 → sex begins to develop - Baby continues to grow - Implantation = the future baby attaches to the uterus, most occur for development to continue Trimesters 1. 1st 3 months → all periods occur, ectoderm/mesoderm/endoderm form, fetus is fully formed by the end - Ectoderm = outer layer of the embryo (Will be the skin and nervous system) - Mesoderm = middle layer of embryo (will be the muscles, bones, and circulatory system) - Endoderm - inner layer of the embryo (will be the lungs and digestive system) 2.4th-6th month → continues to grow, hair/nails/teeth form, brain shows activity and baby can survive abortion by 24th week 3.Last 3 months → continues to grow until mature enough to survive without its mother Other Information - Placenta comes from the baby, has the same DNA - ~Week 16 → doctor can test for genetic abnormalities Assignments: - Test opens 10/11 9/29/16 What We Discussed: Chapter 4 - Teratogens = any substance that is at risk of harming the newborn through the mother - Critical Period = certain time that the teratogen is most likely to cause harm - Page 109 for examples of teratogens and their critical period - Environmental Hazards - Lead - Manufacturing chemicals - Computers - Stress - Parents during Pregnancy = outcome of child - Moms stay healthy and happy - Dads keep moms healthy and happy - Low Birthweight - Less than 2,500 grams (5 ½ lbs) - Possible causes → smoking, drug use, malnutrition Assignments: - Test opens 10/11