+
Bio Tutorial

Bio Tutorial

Rating:
Rating
(0)
Author: Steven Watson
Description:

Discuss how genes are related to chromosomes. 2. Differentiate between somatic cells & gametes, haploid & diploid, homologous chromosomes, and sex chromosomes & autosomes. 3. Describe the structure of DNA and chromosomes during the cell cycle including terminology such as chromatin, sister chromatids, and centromere. 4. Correlate the timing of mitosis within the cell cycle. 5. Identify and describe the major events of mitosis & meiosis. 6. Compare and contrast both the functions and the events in mitosis & meiosis. 7. Describe the differences in meiosis that contribute to spermatogenesis and oogenesis. 8. Discuss how meiosis leads to genetic diversity (crossing over & independent assortment). 9. Explain how mistakes can happen in meiosis and how they affect human health. 10. Interpret karyotypes as male, female, or affected by Downʼs Syndrome (Trisomy 21). 

A. Mitosis and Meiosis are two different types of cell division with different functions. B. Mitosis occurs for growth and repair while meiosis only occurs to make gametes. C. There are 46 chromosomes in somatic cells (23 homologous pairs) and 23 chromosomes in gametes. Keeping the number of chromosomes at 46 in somatic cells is necessary. D. The cell cycle involves periods of growth, preparation for division, and mitosis. E. Mitosis: interphase, prophase, metaphase, anaphase, telophase, cytokinesis. F. After mitosis, cells have 46 chromosomes, 23 pairs (diploid) G. Meiosis: NOT the same as mitosis, two sets of division. After meiosis, cells have 23 chromosomes, haploid. The chromosomes move differently during the two divisions. H. Meiosis is important for keeping the number of chromosomes constant in our population and increasing genetic diversity. I. There are two ways that meiosis increases genetic diversity: crossing over is the exchange of pieces of one chromosome for pieces of another; random assortment is the random alignment and distribution of chromosomes at the midline and following the two divisions. J. Meiosis in males occurs throughout adulthood. Meiosis in females begins before birth and only completes after fertilization. K. If meiosis does not occur properly, it can lead to an extra chromosome or no chromosome to be present in a gamete and can lead to genetic conditions like Downʼs Syndrome, Klinefelter, or Turner Syndrome

(more)
See More
Try a College Course Free

Sophia’s self-paced online courses are a great way to save time and money as you earn credits eligible for transfer to over 2,000 colleges and universities.*

Begin Free Trial
No credit card required

25 Sophia partners guarantee credit transfer.

221 Institutions have accepted or given pre-approval for credit transfer.

* The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 20 of Sophia’s online courses. More than 2,000 colleges and universities consider ACE CREDIT recommendations in determining the applicability to their course and degree programs.

Tutorial

Cell Division

Mitosis

Source: Youtube.com