PSYB32H3 Chapter Notes - Chapter 2: Chorionic Villi, Amniotic Sac, Blood Test

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Transactions among a vast array of hereditary and environmental factors begin before birth. Such transactions between genes and the environment make each newborn unique, and they continue to shape the individual"s characteristics throughout his or her lifespan. Genotype: the particular set of genes that a person inherits from her parents. With the exception of identical twins, no two individuals have the same genotype. Phenotype: created by the interaction of a person"s genotype, or genetic makeup, with the environment; the visible expression of the person"s particular physical and behavioural characteristics. This beginning is the start of a 9-month long period that normally ends with a full-term baby 7 or 8 pounds and roughly 50 cm long. Chromosomes: thread-like structures, located in the central portion, or nucleus, of a cell, that carry genetic information to help direct development. When the egg and sperm unite 23 chromosomes from each of these cells unite together to create 23 chromosome pairs or 46 chromosomes.

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