19 - Cellular basis of reproduction and inheritance Beyond...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Cellular basis of reproduction and inheritance Beyond the mechanisms, why is this important to know? 1. heritable syndromes such as Downs, cycle cell anemia, alcoholism, and hemophilia 2. Resistance of bacteria to antibiotics, insects to pesticides or weeds to herbicides. 3. What are cancers and how can they be controlled 4. Are GMOs stabile and safe? To understand these important topics we need to know 1. what is a heritable unit 2. how traits are inherited 3. How traits are organized onto a chromosome 4. How chromosomes replicates 5. How mutations arise 6. How cell replication goes out of control 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
The fundamentals Cells arise only from preexisting cells Prior to Louis Pasteur it was thought that life originated from decaying organic matter. This concept was called SPONTANEOUS GENERATION For instance, mice spontaneously formed from stored grain or fly maggots from rotting meat. Why would people come to such conclusions? There was absolutely no understanding of life cycles at that time. The wrath of what ever god people believed in had a large influence on how observations were interpreted. Pasteur was able to show that a nutrient rich broth of meat was properly sterilized and sealed remained sterile. Life did not spontaneously arise. As we learned in Chapter 4, the invention of the microscope and the application of the scientific method [hypothesis testing] resulted in Rudolf Virchow stating that “where a cell exists, there must have been a preexisting cell.” 2
Background image of page 2
If cells arise from preexisting cells then there must be a way for cells to reproduce. If cells arise from preexisting cells then there was no beginning and there will be no end. Cell replication is a cycle. Figure 8.5 shows this cycle as the mitotic phase and
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 9

19 - Cellular basis of reproduction and inheritance Beyond...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online