biol+1+reproduction+lessons

You will find a Powerpoint version of the investigation of Sexual reproduction. As part of completing your work on this section, I would like you to complete the summary tasks below that you didn't have time to do in class. Aim to make a contribution before Friday's lesson.

[|biol 1 sexual reproduction.pps] [|biol 1 sexual reproduction.ppt] To keep the file size down I have not included the movie files but you still have the animations. Also, the quiz questions did not transfer to powerpoint so you will not have these either. Anyway, take time to review the notes, diagrams and animations, as well as completing the homework sheet given in class. Also refer to the textbook. Then post comments to the tasks below. The more ideas you can incorporate the better! Again, collaboration is the key here.

2. To keep the survival of a particular species 3. to estabish a bond betwen two individuals. (human) 4. insert a comment || 1. need to find a mate to reproduce with 2. slow process 3. the offspring may not always survive, this is especially bad for animals that produce only one offspring ever year or 2 years. 4. As the DNA from 2 people is different, there is a chance of mutations and things going wrong with the offspring. ||
 * = **SEXUAL REPRODUCTION ** ||
 * = **ADVANTAGES ** ||= ** DISADVANTAGES ** ||
 * 1. creates diversity amongst offspring

2.GAMETES 3.ZYGOTE 4.MITOSIS
 * ** Important term to know ** || ** Why is it important to know this term? (What is its link to sexual reproduction?) ** ||
 * 1.MEIOSIS

5.SPERM CELL 6. fragmetation 7. hormone/s 8. ovaries/testes 9. 10. || 1. The process that occurs in germ cells to produce gametes 2. Produced as a result of meiosis 3.The fusion of the male and female gametes (fertilisation) 4.The duplication of one cell. The daughter cells are identicle. Relevant because mitosis has to occur before meiosis happens in order for there to be an everlasting number of the sex cell cell. 5.Sperm cells are the male gametes. 6.regeneration of parts broken off and organism, usually simple animals such as a sea star 7. hormones control various happenings, and are responsible for the cycle and processes occuring in our reproductive system (hormones differ in males and females). 8. reproductive organs at which gametes are produced: eggs (in ovaries - females) and sperm (in testes - males). 9. 10. ||

2.In both processes daughter cells are produced. 3.Both processes involve the division of cells 4.Both are involved in creating new/more cells 5. At first, each chromosome duplicates (clones itself) to form 2 identical sister chromatids. 6. In both processes duplication and replication of the chromosomes/sister chromatids occurs at some stage. || 2.Daughter cells only contain half (haploid) the amount of chromosomes 3.Meiosis only takes place in the genitals 4.1 cell creates 4 cells 5. Only gametes (sex cells) are involved. || 1. Invovles only 1 division to produce daughter cells 2.Daughter cells contain the full amount (diploid) of chromosomes. 3. Mitosis occurs everywhere in the body 4.1 cell creates 2 cells 5. Body cells are involved. ||
 * = **Main topic: Cell reproduction ** ||
 * = **Sub topic: Meiosis** ||= **Sub topic: Mitosis** ||
 * = **<span style="FONT-SIZE: 120%; COLOR: rgb(147,27,27)">Alike ** ||
 * <span style="COLOR: rgb(19,22,241)">1. In both processes chromosomes line the metaphase plate.
 * = **<span style="FONT-SIZE: 120%; COLOR: rgb(147,27,27)">Differences ** ||
 * <span style="COLOR: rgb(19,22,241)">1. Involves 2 divisions to produce daughter cells

2. advantages and disadvantages of sexual reproduction 3. <span style="COLOR: rgb(19,22,241)">advantages and disadvantages of asexual reproduction <span style="COLOR: rgb(19,22,241)">4.the ovulation and preparation for an offspring in the female reproductive system. 5.the process of semen being made and travelling through the male reproductive system. 6.the different stages of both meiosis and mitosis 7.the number of chromosones found in the product of meiosis and mitosis 8.the different methods of asexual reproduction 9.the hormones are released to get things going 10. the specific roles of different hormones, and where/when they are used. 11. why reproduce. 12. differences between sexual and asexual reproduction. ||
 * <span style="FONT-SIZE: 140%; COLOR: rgb(111,117,26)">** What do you think you need to be able to understand on the topic of reproduction? ** ||
 * <span style="COLOR: rgb(19,22,241)">1. similarities and differences between the process of mitosis and meiosis

<span style="COLOR: rgb(19,22,241)">Comment on whether you think the diagrams (A and B) on the right represents a stage from mitosis or meiosis.

Image A looks like meiosis as the chromosomes are lining the metaphase plate, but they do not separate. Image B is mitosis as the chromosomes are on their way to the opposite poles.

I would have to agree with the above statement, Image A does look like it is part of the Meiosis process as the homologous pairs are not being separated but being pulled together to the poles of the cell. However Image B could be either mitosis or meiosis as in both processes at one point, chromosomes are being pulled apart to either pole of the cell.

I agree that image A is meiosis becasue the chromosones are 'crossing over' even though we dont really know what that means. As for image B, I am thinking it is mitosis because the cell is only going to divide once it elongates (stretches). In meiosis i think the seperation just happens. i ALSO agree :P in picture A the chromosomes are being pulled to each of the poles and getting ready to split

AGREED. diagram A is meiosis (I), as the cell looks like its preparing to split down the centre, before later splitting again (meiosis II) across the middle, to create 4 cells. And, diagram B is mitosis, at what looks like the stage of anaphase (parting), before then splitting across the middle, to create in comparison only 2 cells.