Monday, January 13, 2014

big idea 3




1) Diploid: a diploid is an organism that consists of two sets of chromosome, usually one from the mother and the other from the father. Most mammals are diploids. The diploid number can be achieved by doubling the haploid number (see #6.) This picture of a whitetail deer is a diploid because it received two sets of chromosomes from its' parents.


4) double fertilization: double fertilization is a complicated mechanism of angiosperms. During double fertilization, the female gametophyte (female flower sex organ) joins with two male gametes (male flower sex organ.) One of the male gametes fuses with the female gametophyte, while the other male gamete fuses with cells that are called polar nuclei. This nucleus divide mitotically to produce the endosperm (see #8 of big idea 4.) This supports the growth of the embryo created by the fusion of the first male gamete and the female gametophyte. This picture of a flower shows double fertilization because all of the flower's sex organs are seen.


5) gamete: a gamete is a reproductive cell having the haploid number of chromosomes. Sexually reproducing parents pass chromosomes on through gamete cells. This chicken egg is gamete, because it has yet to be fertilized.


6) haploid: a haploid cell is a cell that contains half the chromosomes necessary to produce offspring.  Sperm and egg cells are haploid, because they each only have one set of chromosomes. This picture of a flower describes a haploid cell, because there are sex organs visible that have only half the necessary number of chromosome necessary for life.




7) evidence of different alleles: an allele is an alternate form of a gene that arise due to a mutation. There could be many more than just one mutation of a gene, producing a variety of alleles for the same gene. In this picture of cory catfish, although the same species, they have different alleles for color.



8) flock, herd or schooling: A flock (of birds), herd (of land animals), and a school (of fish), are a large group of one species that stay together, with each other. Flocks, herds and schools stay together and act as one for reasons varying from pack-mentality to protection. This is a picture of a school of common goldfish. Even though it appears that they're not really schooling, they're just crammed in together, common goldfish do school when in large groups.






10) Genetically modified organism: a genetically modified organism is an organism whose genetic make up has been altered using genetically engineering techniques. This picture of a banana is a genetically engineered organism because wild bananas have large seeds in them, unlike this farm grown banana.



11) herbivory responses: a herbivory response is an evolutionary change herbivores endure in order to adapt to changes. In my picture for example, a bird (parakeet), may develop a beak overtime in order to peak at things in order to get food.



19) seed dispersal method: a seed dispersal method is a way plant's seeds are designed in order to transport them for reproduction. This "sticker weed", uses its' sticky seeds to stick onto animals. The animals carry the seeds to a new location for them to reproduce.

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