Explore Related Concepts

Best Results From Yahoo Answers Youtube


From Yahoo Answers

Question:1. How is meiosis different from mitosis? 2. Why aren't the offspring that result from sexual reproductioin exactly like either parent? 3. Why is it necessary to reduce the number of chromosomes in gametes by one-half? 4. What is the difference between oogenesis and spermatogenesis, and where does each occur? 5. What is the main problem associated with external fertalization? 6. What is the advantage of internal fertilization over external fertilization? 7. Why is sexual reproduction more advantageous than asexual reproduction? 8. What is the advantage of unequal cytoplasmic division during oogenesis? I am going to post my answers on the more details thing. 1. Meiosis cells are not identical, but in mitosis they are. 2. Nothing 3. If you have 46 in the sperm and 46 in the egg then the zygote will 92 chromosomes and that is twice as many needed. That will cause syndromes. 4. Oogenesis occurs in the female to produce eggs. Spermatogenesis occurs in the male to produce sperm. 5. Nothing. 6. Nothing. 7. Nothing 8. Nothing

Answers:1) Meiosis gives you total of 4 daughter cells in male and only one in females. Meiosis the daughter cells are haploid 23(n). Crossing over of genes occur. Mitosis gives you to identical daughter cells with diploid number 46(n). 2) Because they have 23 chromosomes from dad and 23 from mom. 3) Because other wise each zygote have 92 chromosomes. 4) creation of an ovum (egg cell). It is the female process of gametogenesis. It involves the various stages of immature ova. spermatogenesis is the male version of gametogenesis. 5)I guess the main problem would be that many of them don't stick and the procedure is very expensive. 6)Well internal fertilization doesnot cost 25000$. Other then that Zygote has more chance of survival? 7) Asexual is clone of the thing, while sexual is natural selection. 8) The unequal cytokinesis that occurs has the advantage of providing the ovum with a much greater amount of cytoplasm and stored food than if an equal division were to occur. Hope this helps!

Question:

Answers:There are three differences between what Mitosis accomplishes and what Meiosis accomplishes. A. Mitosis divides one nucleus into two; Meiosis divides one nucleus into four. B. Mitosis conserves chromosome number; Meiosis reduces it in half (usually from diploid [46 in humans] to haploid [23] ). C. Mitosis produces genetically identical daughter nuclei; Meiosis produces genetically different daughter nuclei.

Question:(biology) Mitosis and Meiosis

Answers:Zygote

Question:hi in my Class we are learning about cells i also have a quiz on Monday and i didn't go to school to day can someone plz help me. 1)what the difference between Mitosis and Meiosis 2) when does meiosis happen 3) when does mitosis happen 4) what is prophase 1, metaphase 1, anaphase 1, teleophase 1 AND prophase 2, anaphase 2, metaphase 2, teleophase 2, 5)what is there difference between the two what do the numbers represent. 5)When do they occur (number 5 and 6 is a response to question 4) thanks

Answers:Alright, so I can answer a few of your questions, but you'll have to research some of these also. 1) The main difference between Mitosis and Meiosis is the way the genes are passed on. Mitosis is the process where a cell will divide with itself; like your skin's cells. Your epithelial cells divide themselves to produce more skin cells. The important thing here is the identical genetic code is passed on from cell to cell. Now Meiosis involves sexual reproduction. In meiosis the cell only has half the genetic code because it must join with another cell. For instance, sperm has half the genetic code of a normal cell because it must fertilize an egg. 2) Meiosis takes place during sexual intercourse; because both of the cells coming together only have 1/2 of their genetic code, the mixing allows for mutations to occur. 3) Mitosis happens at different times depending on what part of the body your at. For instance, your skin's cells are constantly dividing, thus mitosis occurs throughout the day on your skin. However, neurons only go through mitosis at the start of life since they do multiply later in life. 4) Alright so PMAT is basically the steps a cell goes through in mitosis and meiosis. PMAT2 is the steps that a cell goes through when in meiosis. Basically a cell going through meiosis will go through PMAT and then PMAT2 to produce gametes (eggs and sperm). 5) PMAT occurs at different times depending on the tissue. It really comes down to the genes in the nucleus which tell the cell to divide. PMAT2 however occurs after PMAT has happened in a cell going through meiosis. Whew, remember to research all this for yourself, it's been about a year since I studied this in my biology classes. Good luck on your test!

From Youtube

Biology Mitosis vs. Meiosis :www.mindbites.com In this lesson, mitosis and meiosis are compared in terms of DNA replication, the number of divisions, the presence of synapsis, the number of daughter cells, and the numbers of chromosomes in the products and function. From a similarity standpoint (between meiosis and mitosis), in both: DNA is replicated and the process consists of phases (prophase, metaphase, anaphase, telophase). On the flip side, Meiosis and Mitosis differ along the following dimensions: number of divisions (1 for mitosis and 2 for meiosis), synapsis is only a characteristic of meiosis (in prophase I), the number of daughter cells produced varies (4 non-identical haploid cells in meiosis and 2 identical cells in mitosis), the number of chromosomes in resulting cells varies (2N in mitosis to match the original parent cell and only N in meiosis as the resulting cells are haploid), and the function/objective of the processes vary (somatic cells are produced via mitosis and gametes are produced by meiosis).Taught by Professor George Wolfe, this lesson was selected from a broader, comprehensive course, Biology. This course and others are available from Thinkwell, Inc. The full course can be found at www.thinkwell.com The full course covers evolution, ecology, inorganic and organic chemistry, cell biology, respiration, molecular genetics, photosynthesis, biotechnology, cell reproduction, Mendelian genetics and mutation, population genetics and mutation, animal systems and homeostasis ...

AP Biology; Mitosis and Meiosis :AP Bio Claymation. Carley Cole, Sydney Lanier, Austin Blankenship