CBNS 108 Lecture _2, 2010, handout sheet

CBNS 108 Lecture _2, 2010, handout sheet - Summary for...

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2 Summary for Lecture 3/30/10 Summary for Lecture 3/30/10 I discussed some of the history of DB. The views of Aristotles (preformation vs epigenesis) Critical advances made based on the Cell Theory The discovery of existence of germ vs somatic cells Germ cells are haploid (1 set of chromosomes) Fertilized egg or zygote (2 sets of chromosomes, one from male one from female) Organisms are composed of cells The cell is the basic unit of life.
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2 Summary (cont.) Summary (cont.) Most animals and plants are composed of many cells that arise from a single cell. Therefore development must be epigenetic and not by preformation since a single cell (the fertilized egg) results in many different types of cells. Only the germ cells (egg and sperm) pass characteristics onto the offspring. Somatic cells are not directly involved in passing on traits to the next generation and characteristics acquired during an animal's life are not passed onto the offspring.
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2 Outline for Lecture 05-11-10 Outline for Lecture 05-11-10 1. Fertilization (next lecture) 2. Types of development 3. Processes occurring during Development 4. Differential cell behavior 5. Differential gene expression
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2 Gregor Mendel’s work on peas really cemented this idea Male germ cell + Female germ Cell (haploid) Fertilized egg (Zygote) (diploid) Embryonic Development (diploid) Fully developed organism (diploid)
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2 Outline for Lecture 05-11-10 Outline for Lecture 05-11-10
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2 Types of Development Types of Development 1. Mosaic Involves cytosolic and nuclear determinants 2. Regulatory Involves induction events
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Mosaic development Mosaic development 1. Mosaic development depends upon specific determinants in the one-celled zygote that are not divided equally between the daughter cells (Weismann early 1880’s). Figure 1.7
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CBNS 108 Lecture _2, 2010, handout sheet - Summary for...

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