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Lecture 4

PSYC 2500 Lecture 4: Child Development class 4

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Carleton University
PSYC 2500
Kim O' Neil

Child Development Class 4 January 18, 2016 Conception to birth - Zygote = 1-2 weeks - Embryo = 3-8 weeks - Fetus = 9-38 weeks Zygote: - Fertilization to implantation - Begins when egg is fertilized in the fallopian tube - Rapid cell division happens as it travels down the fallopian tube - After the egg is implanted in the wall of the uterus there is officially a pregnancy - If the egg is not fertilized it gets released through the uterus via period - Blastocyst= fetalized egg 4 days after conception, consists of about 100 cells and resembles a hollow ball - Germ disc= a small cluster of cells near the center of the zygote that develops into the baby - Placenta= the structure through which nutrients and wastes are exchanged between the mother and the developing child - Sperm determines the gender of the baby Pregnancy Tests - Pregnancy tests look for the presence of a hormone which is produced by the placenta - The placenta begins developing after the fertilized egg is implanted in uterine wall - This happens about 6 days after conception Famous Canadian Quintuplets - Dionne quintuplets - First known quintuplets to survive child birth - Lived into adulthood - Taken aware from parents - Became an attraction, grew up in public eye - Identical twins, all came from same sperm and same egg Gender - 23 chromosome on the gamete (sex cell) contributes to gender - Females = XX - Males= XY - Gender selection: Legal in most US states - Legal in Canada for medical reasons, NOT for family balancing - Methods of gender selection : Selective abortion, sperm sorting,(78-85% for boys, 73-75% for a girl) gender selective IVF(success rate 97-99% for either girl or boy) Embryo: - 3-8 weeks after conception - Once the blastocyst is embedded into uterine wall its called an embryo - Body parts and internal structure are formed during this period - 3 layers of the embryo - 1) Ectoderm: Outer layer of the embryo, hair, outer layer of skin, nervous system - 2) Mesoderm: middle layer of embryo, muscles, bones, circulatory system - 3) Endoderm: Inner layer, digestive system and lungs - Amniotic fluid and sac protect the fet
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