HDF 100 Lecture Notes - Lecture 3: Umbilical Cord, Cell Division, Prenatal Development
11 Sep 2016
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Document Summary
The basic unit for the transmission of heredity instructions. A carrier of genes; one of the 46 molecules of dna (in 23 pairs) that each cell of the body contains and that, together, contain all human genes. The molecular basis of heredity, constructed of a double helix whose parallel stands consist of both pairs held together by hydrogen bonds. Progression: conception, duplication, division, differentiation 8 cell stage specialization begins. 2 separate ova fertilized by 2 separate sperms. Down syndrome most well known extra 21st chromosome. An organism"s entire genetic inheritance or genetic potential. The person"s actual appearance & behavior (the result of both genetic and environmental influences) 266 days, or 40 weeks, or 9 months, or forever. Monthly ovary releases ova & it begins down the fallopian tube doesn"t propel itself. Conception takes place in fallopian tube sperm swimming upstream to meet ova (can"t feel it no test will tell)
