Sci 9A Lesson 5 April 7 - Meiosis

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Homework from last class: ,[object Object],[object Object]

Quiz Time! ,[object Object],[object Object]

Meiosis ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],Meiosis occurs in 2 phases: Meiosis I (1 st cell division) Meiosis II (2 nd cell division) Meiosis I Meiosis II

[object Object],[object Object],Fig 6.4 p. 191

[object Object],[object Object],[object Object],Fig 6.5 p. 191

[object Object],[object Object],[object Object],[object Object],Fig 6.5 p. 191

[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object],[object Object],[object Object],Fig 6.4 p. 191

Homework for next class: ,[object Object]

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Lab Template Week 4: Meiosis Submitted by: <your name here> As you complete the lab, record your answers in this template. Save the document as LastName_FirstName_BIO1020_W4A3, and submit it to the Dropbox. Full lab instructions and the rubric with which you will be evaluated can be found in the online classroom. Activity Cellular reproduction in Eukaryotes involves either mitosis or, in the case of sex cells, meiosis. Mitosis involves the reproduction of a cell into two identical daughter cells. Meiosis, however, is a reduction division where a parental diploid cell produces four haploid gametes. Upon fusion, two haploid gametes (in humans the sperm and the egg) will result in one diploid zygote. In this activity you will track chromosomes through meiosis using colored beads. Experiment 1 Questions 1. Why is crossing over important in heredity? (10 points) 2. Provide two ways that meiosis I and meiosis II are diﬀerent. (10 points) 3. (10 points) a. In the lab, how many chromosomes were present in each cell when meiosis I started? b. How many chromosomes were present in each daughter cell at the end of meiosis II? 4. If humans have 46 chromosomes in each of their body cells, determine how many chromosomes you would expect to find in the following (10 points): Sperm: Egg: Daughter cell from mitosis: Daughter cell from meiosis II: 5. Why is it necessary to reduce the chromosome number of gametes, but not of other cells of an organism? (10 points) 41 Meiosis Lab 4 42 Lab 4: Meiosis 43 Introduc on Meiosis only occurs in organisms that reproduce sexually. The process generates haploid (1n) cells called gametes (sperm cells in males and egg cells in fe- males), or spores in some plants, fungi, and pro sts, that contain one complete set of chromosomes. Haploid cells fuse together during fer liza on to form a diploid cell with two copies of each chromosome (2n). Genes are the units of heredity that have speciÞc loci (loca ons) on the DNA strand and code for inheritable traits (such as hair color). Alleles are alterna ve forms of the same gene (brown vs. blue eyes). Homol- ogous chromosomes contain the same genes as each other but o en di erent alleles. Non-sex cells (e.g. bone, heart, skin, liver) contain two alleles (2n), one from the sperm and the other from the egg. Mitosis and meiosis are similar in many ways. Meiosis, however, has two rounds of division—meiosis I and meiosis II. There is no replica on of the DNA between meiosis I and II. Thus in meiosis, the parent cell produces four daughter cells, each with just a single set of chromosomes (1n). Meiosis I is the reduc on division– the homologous pairs of chromosomes are separated so that each daughter cell will receive just one set of chromosomes. During meiosis II, sister chroma ds are separated (as in mitosis). Concepts to explore: Meiosis Diploid cells Haploid cells ...

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