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prenatal_first_exam_information - Instructor Note What...

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Instructor Note: What endless questions vex the thought, of whence and whither, when and how Sir Richard Burton, English Explorer, 19 th Century The very meaning of life involves beginnings. Every one of the species have the ability to carry forward characteristics from one generation to another generation. But, there has to be a mechanism to carry this information forward and we find it in the genetic code. And, what is amazing is that we find this genetic code within every cell within our bodies. Lecture Notes: Let’s just review a few things Read carefully information on genetics We start out a single cell The nucleus of each human cell has 46 chromosomes, which are threadlike and come in 23 pairs, one of the pair coming from each parent. DNA is deoyribonucleric acid which is a complex molecule containing genetic information Gametes are human reproduction cells created in the testes of males and ovaries of females Meiosis is the process of cell division in which each pair of chromosomes in the cell separates with one member of each pair going into each gamete or daughter cell. Each human gamete has 23 unpaired chromosomes Reproduction begins with the fertilization of a female’s gamete/ovum by a male’s gamete/sperm.
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