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Renee Kozicki

on 28 November 2016

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Transcript of Reproduction

Sexual Reproduction
-Advantages: genetic variation! There is a higher chance of survival when an environment changes if there is genetic variation in a species.
-Disadvantage: Takes longer for offspring to be made
go to brainpop.com, log in using the information on the board, and use headphones to watch the video called "asexual reproduction"
Asexual Reproduction
-Involves 1 parent
-Offspring are genetically identical to the parent
-Advantages: fast
-Disadvantages: There is no genetic variation so all of them could die if there was a change in the environment.

Sexual Reproduction
-Involves 2 parents
-The parents’ DNA is combined to produce offspring that are genetically different from the parents.
-Sperm (from the male) and an egg (from the female) transfer the genetic material (DNA)

-Reproduction is the ability to produce offspring that are similar to the parent.
-Francesco Redi and Louis Pasteur both showed that living things do not spontaneously appear (1600s)

Reproduction Notes
Methods of asexual reproduction
1)BINARY FISSION: genetic material (DNA) is copied and the cell divides in half, splitting the ribosomes and cytoplasm
-Examples: Bacteria, most unicellular organisms
2)BUDDING: Offspring begin to grow off the organism and will eventually separate, becoming a new organism
-Examples: hydra and some other cnidarians, yeast, and fungi (when living conditions are good) and also sponges
Sexual Reproduction
-Fertilization is when the egg and sperm combine their genetic material and form a zygote which has a complete set of DNA or chromosomes
-haploid cells have half the genetic information (sperm and egg)
-diploid cells have a complete set of genetic information (zygote or body cells)
-Examples: Amphibians, angiosperms (flowering plants), birds, cnidarians (jellyfish, sea anemones, coral), ferns, fish, fungi, gymnosperms, mammals, plants, sponges, insects
Essential Question: What are the two main types of reproduction? What are the advantages and disadvantages of each?
3)FRAGMENTATION: the parent breaks into two pieces and each piece becomes a new offspring
-Examples: planaria, sponges
4)CUTTING: a portion of a plant may be cut and replanted, growing roots and creating a new plant
Haploid cell
23 chromosomes
half of the normal number of chromosomes
Haploid cell
23 chromosomes
half of the normal number of chromosomes
Diploid cell
46 chromosomes
one complete set of chromosomes
each parent contributes half of the genetic information for the offspring
Full transcript