Date: 02/08/16
MEIOSIS:
MEIOSIS:
There are a few key differences between mitosis and meiosis. First, mitosis only goes through PMAT (prophase, metaphase, anaphase, and telophase) once, while meiosis goes through it twice. Second, meiosis is for sex cells, while mitosis is for every other cell in the body. Perhaps the biggest difference is that in meiosis, there is crossover that creates new gene combinations, which makes all of the DNA in each cell slightly different. This is the reason that people are not clones of each other. In meiosis, meanwhile, the two daughter cells at the end are exact clones of the original cell.
PLANT REPRODUCTION:
PLANT REPRODUCTION:
Pistil: The ovary is where ovules are produced, which will eventually become seeds. The stigma is the part where pollen germinates, which is what makes the plant grow from the seed. The style, meanwhile, is the stalk that connects the connects the ovary with the stigma.
Stamen: The filament's job is simply to support the anther, because the anther is where pollen is made. As stated above, pollen is what causes the plant to grow from a seed.
Petals: Petals are the prettiest parts of the flower, and often protect the rest of the plant from environmental harm.
Plants have gametes (the male gametes are in a plant's anthers, and the female gametes are in the plant's ovaries). Pollination is when the male and female gametes are brought together. Since plants obviously cannot move, this happens via other environmental factors, such as bees and butterflies traveling from plant to plant.
Once pollination is done, fertilization can happen. The chromosomes of the gametes combine, so that the newly fertilized plant cell has chromosomes from both the male and female gametes. This then develops into a seed, which is often protected by a fruit.
Stamen: The filament's job is simply to support the anther, because the anther is where pollen is made. As stated above, pollen is what causes the plant to grow from a seed.
Petals: Petals are the prettiest parts of the flower, and often protect the rest of the plant from environmental harm.
Plants have gametes (the male gametes are in a plant's anthers, and the female gametes are in the plant's ovaries). Pollination is when the male and female gametes are brought together. Since plants obviously cannot move, this happens via other environmental factors, such as bees and butterflies traveling from plant to plant.
Once pollination is done, fertilization can happen. The chromosomes of the gametes combine, so that the newly fertilized plant cell has chromosomes from both the male and female gametes. This then develops into a seed, which is often protected by a fruit.
Plants have both diploid and haploid generations. The haploid generation is formed through meiosis, while the diploid generation is formed through mitosis. The haploid gametes are fertilized and eventually become diploid cells, which then form a diploid plant. After undergoing meiosis, haploid cells are formed, and a haploid plant appears. Mitosis then occurs, and the whole process starts over again.
REFERENCES:
1. http://www.amnh.org/learn/biodiversity_counts/ident_help/Parts_Plants/parts_of_flower.htm
2. https://www.vocabulary.com/dictionary/filament
3. http://sciencelearn.org.nz/Contexts/Pollination/Science-Ideas-and-Concepts/Pollination-and-fertilisation
4. http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/A/Alternation.html
REFERENCES:
1. http://www.amnh.org/learn/biodiversity_counts/ident_help/Parts_Plants/parts_of_flower.htm
2. https://www.vocabulary.com/dictionary/filament
3. http://sciencelearn.org.nz/Contexts/Pollination/Science-Ideas-and-Concepts/Pollination-and-fertilisation
4. http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/A/Alternation.html