Meiosis – Vocabulary and Notes
What looks similar between mitosis and meiosis? What looks different? Interphase Prophase Cytokinesis Telophase Anaphase Metaphase
Vocabulary- Meiosis Process of reduction division in which the number of chromosomes per cell is cut in half through the separation of homologous chromosomes in a diploid cell.
Vocabulary- Homologous a pair of chromosomes, one from each parent, which carry genes for the same traits.
Vocabulary- Diploid term used to refer to a cell that contains both sets of homologous chromosomes.
Vocabulary- Haploid term used to refer to a cell that contains only a single set of genes.
Check for Understanding A diploid cell has _____ number of chromosomes.
Check for Understanding A haploid cell has _____ number of chromosomes.
Vocabulary- Crossing Over process in which homologous chromosomes exchange portions of their chromatins during meiosis.
Gametes & Zygote � Gametes are reproductive cells that unite during sexual reproduction to form a new cell called a zygote. � Gamete › Ex: Sperm cells & Egg cells › Zygote › Ex: Fertilized Egg- Grows to be a human
› Homologous pairs of chromosomes have genes for the same traits › For each homologous pair, one chromosome comes from each parent
Notes Sexual Repro Meiosisi. mov
Check for Understanding How many Chromosomes do humans have?
Check for Understanding How many Chromosomes do you get from your mom?
2. Phases of Meiosis a) Meiosis: cell division where the chromosome number is cut in half by separating homologous chromosomes in a diploid cell b) There are two stages: Meiosis I and Meiosis II
Visualizing Meiosis (938. 0 K)
Meiosis. mov Link s Mitosis and Meiosis - B (9. 0 K) http: //www. pbs. org/wgbh/nova/baby/divi _flash. html
Check for Understanding True/False Mitosis produces four haploid cells.
Check for Understanding True/False Meiosis produces identical cells.
Check for Understanding Knowing that a human has 2 N=46 chromosomes. How many chromosomes would you expect to find in a sperm cells?
Check for Understanding How many chromosomes would you expect to find in a white blood cell?
Haploid cells develop into mature gametes � Gametogenesis is the production of gametes � Gametogenesis differs between females and males – Sperm become streamlined and motile – Sperm primarily contribute DNA to an embryo – Eggs contribute DNA, cytoplasm, and organelles to an embryo – During meiosis, the egg gets most of the contents; the other cells form polar bodies
Now draw the following picture in your notes … it will fill up the whole slide
Diploid Parent Cell DNA copies itself 1 st meiotic division (haploid) 2 nd meiotic division (haploid)
Fate of the 4 haploid cells: �If it is from the male parent, all 4 will become sperm cells �If it is from the female parent, 1 will be an egg and the other 3 gametes die Mitosis & Meiosis pipe cleaner Lab