Psychology 2040A/B Lecture 3: Psych (2) week 3

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This is an imprint of an actual placenta. It is a big organ for expecting mothers to grow in the first trimester. Just like growing a new lung or heart, it takes a lot of energy. ** growing this is one of the reasons women experience quite a bit of fatigue in the first trimester. Phenotype: directly observable characteristics, which depend, in part of their genotype ex) hair colour. Genotype: the complex blend of genetic information that determines our species and influences all of our unique characteristics. Chromosomes: rod like structures in the nucleus of the cell, which store and transmit genetic information. 23 matching pairs (46 total chromos), one from each pair coming from mom and the other coming from dad. Gene: a segment of dna along the length of a chromosome, not easy to find where it starts and ends. ** there are an estimated 20000-25000 genes on a chromosome.

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