Chromosome Number, Fertilization MIX
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Slide 1 - Chromosome Number, Fertilization
Slide 2 - Review
- There are two ways living things can reproduce: asexually and sexually
- Reproduction passes DNA on to the next generation; DNA carries all the information needed to make a new living thing!
- DNA can coil itself into a condensed structure called a chromosome; this only happens during cell division
- Meiosis is a special type of cell division that takes place only in the sex organs
- Meiosis the type of cell division that produces gametes (egg, sperm)
- Gametes contain half the amount of DNA as all the other cells in the body of the organism
Slide 3 - Chromosome Number
- For living things that reproduce sexually (like us, most animals and plants), we use two terms to describe the amount of DNA in a cell
- Diploid = a cell that contains TWO copies of each type of chromosome (or piece of DNA)
- Most normal body cells are diploid
- Diploid cells have 50% of the DNA from each parent
- Haploid =a cell that contains only ONE copy of each type of chromosome (or piece of DNA)
- Only GAMETES are haploid
- Haploid cells RESULT FROM MEIOSIS
Slide 5 - To Sum Up:
- In sexually reproducing organisms, the process of MEIOSIS produces HAPLOID GAMETES in the SEX ORGANS
Slide 6 - How to (BIOLOGICALLY) MAKE A BABY!
Slide 7 - FERTILIZATION
- Fertilization is the process of joining GAMETES. The very first cell that results from the joining of these cells is called a ZYGOTE. This is the first cell that contains a complete set of DNA.