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Write everything that is underlined Section 6-1 Chromosomes & Meiosis Section 6-1 Chromosomes & Meiosis.

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Presentation on theme: "Write everything that is underlined Section 6-1 Chromosomes & Meiosis Section 6-1 Chromosomes & Meiosis."— Presentation transcript:

1 Write everything that is underlined Section 6-1 Chromosomes & Meiosis Section 6-1 Chromosomes & Meiosis

2 6.1 Chromosomes and Meiosis One of Biologys Essential Questions: At the end of this unit you will need to be able to answer this question … The Big Question: WHY ARE ALL HUMANS DIFFERENT????? …Look around the room- no one is exactly like you …Your siblings are not exactly like you (unless you have an identical twin) …There is an amazing process that makes us all different … meiosis

3 6.1 Chromosomes and Meiosis KEY CONCEPT: Gametes have half the number of chromosomes that body cells have

4 6.1 Chromosomes and Meiosis Fill out this chart for reference as we move along in our notes Fill out this chart for reference as we move along in our notes TermDefinition Somatic Cell Gamete Homologous Chromosome Autosome Sex Chromosome Sexual Reproduction Fertilization Diploid Haploid Meisois

5 6.1 Chromosomes and Meiosis A. Body cells and gametes 1. Body cells are also called somatic cells 1. Body cells are also called somatic cells 2. Gametes are sex cells: egg and sperm 2. Gametes are sex cells: egg and sperm –Gametes have DNA that can be passed to offspring (Psst…Fill out your vocabulary chart…) body cells sex cells (sperm) sex cells (sperm) sex cells (egg)

6 6.1 Chromosomes and Meiosis Take a Vote!!!! Is a skin cell a somatic cell or a gamete? -Somatic Is an egg a somatic cell or a gamete? -Gamete What is a liver cell considered- somatic or gamete? -Somatic What is another type of somatic cell? -Sperm Cell

7 6.1 Chromosomes and Meiosis 1.Your body cells have 23 pairs of chromosomes 2.The first 22 pairs of chromosomes are autosomes 3.Sex chromosomes (X and Y) determine what gender you will be (male or female) B. Autosomes and sex chromosomes

8 6.1 Chromosomes and Meiosis 4. Homologous pairs of chromosomes have genes for the same traits 5. For each homologous pair, one chromosome comes from each parent

9 6.1 Chromosomes and Meiosis Think-Pair-Share (2 min.) Do you believe that homologous chromosomes are identical to each other?Do you believe that homologous chromosomes are identical to each other? Why or why not???Why or why not???

10 6.1 Chromosomes and Meiosis 1.Diploid (2n) cells have two copies of every chromosome –Body cells are diploid –Half the chromosomes come from each parent C. Diploid and Haploid

11 6.1 Chromosomes and Meiosis 2.Haploid (n) cells have one copy of every chromosome –Gametes (sex cells) are haploid –Gametes have 22 autosomes and 1 sex chromosome

12 6.1 Chromosomes and Meiosis Quick Thinking! You can write, draw, diagram, or write a quick song for your answer…You can write, draw, diagram, or write a quick song for your answer… Why is it so important that gametes are haploid cells? What would happen if, for some reason, it occurred that one wasnt?Why is it so important that gametes are haploid cells? What would happen if, for some reason, it occurred that one wasnt?

13 6.1 Chromosomes and Meiosis D. Fertilization: When the egg and sperm cell unite 1.2 haploid cells unite to form a cell (zygote) that once again has the diploid number of chromosomes –Chromosome number must be maintained in animals –Many plants have more than two copies of each chromosome 2.A zygote grows to be a human

14 6.1 Chromosomes and Meiosis REMEMBER THIS REMEMBER THIS Mitosis and meiosis are types of nuclear division that make different types of cellsMitosis and meiosis are types of nuclear division that make different types of cells Mitosis makes more identical diploid cellsMitosis makes more identical diploid cells

15 6.1 Chromosomes and Meiosis Meiosis makes haploid cells from diploid cells and:Meiosis makes haploid cells from diploid cells and: –occurs in sex cells –produces gametes

16 6.1 Chromosomes and Meiosis Compare and Contrast MITOSIS and MEIOSIS on a separate sheet of paper based on what you already know about both. Turn in at the end of the period before you walk out the door. Differences go HERE Things they have in common go HERE Differences go HERE


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