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Set Cornell Notes onand pg. Meiosis 6.1 up Chromosomes 65 6.1 Chromosomes and Meiosis 2.1 Atoms, Ions, and Molecules •Topic: 6.1 Chromosomes and Meiosis •Essential Question: 1. Where are germ cells located in the human body? 2. Draw a double-bubble map comparing and contrasting autosomes and sex chromosomes 1. 2. Where are germ cells located in the human body? Draw a double-bubble map comparing and contrasting autosomes and sex chromosomes Key Concept: Gametes have half the number of chromosomes that body cells have 6.1 Chromosomes and Meiosis KEY CONCEPT Gametes have half the number of chromosomes that body cells have. 6.1 Chromosomes and Meiosis • Human body cells have 23 pairs of chromosomes and 46 total – Each pair of chromosomes is called Homologous pairs and have copies of the same genes – In each pair, one chromosome comes from each parent. *Homo= same Mom Dad 6.1 Chromosomes and Meiosis • You have two types of specialized cells: Somatic cells and Germ cells Will become… 6.1 Chromosomes and Meiosis • Somatic cells- are body cells and make up most of your body tissues and organs. – Liver cells – Lung cells – Heart cells etc… Red blood cells skin cells bone cells intestinal cells 6.1 Chromosomes and Meiosis Somatic (body) cells are Diploid (2n) cells have two copies of every chromosome (23 from mom, 23 from dad) for a total of 46 chromosomes n n 2n *di= 2 6.1 Chromosomes and Meiosis Germ cells- are the cells in your reproductive organs •located in the ovaries and testes •Develop into gametes 6.1 Chromosomes and Meiosis Gametes are sex cells: egg and sperm •Both have DNA that can be passed to offspring. Egg Sperm 6.1 Chromosomes and Meiosis • Gametes are Haploid (n) cells have one copy of every chromosome. – Have 22 autosomes + 1 sex chromosome = 23 chromosomes each 23 23 6.1 Chromosomes and Meiosis • You have two types of specialized cells: Somatic cells Germ cells • Undergo mitosis • Undergo meiosis • body cells • Cells in reproductive organs (ovaries/testies) • Diploid • 46 chromosomes • Become gametes (sperm/eggs) • Identical to parent cell • Haploid • 23 chromosomes • Each are Unique 6.1 Chromosomes and Meiosis • You have two types of chromosomes: Autosomes and Sex Chromosomes 6.1 Chromosomes and Meiosis •Chromosome pairs 1-22 are called autosomes •Contain genes not directly related to your gender 6.1 Chromosomes and Meiosis Pair #23=Sex chromosomes: X and Y • determine gender • Control the development of sexual characteristics XX= female XY= male XX XY 6.1 Chromosomes and Meiosis Points to Ponder 1.Where are germ cells located in the human body (2 places) 2.Do you think that Y chromosomes contain genes that are critical for an organism’s survival? Explain. 6.1 Chromosomes and Meiosis Points to Ponder 1. Where are germ cells located in the human body (2 places) • In the reproductive organs: The ovaries in women and the testes in men. 2. Do you think that Y chromosomes contain genes that are critical for an organism’s survival? Explain. • No, a Y chromosome is not necessary for survival. Females do not have a Y chromosome, and they are able to survive. Set Cornell Notes onand pg. 6.1 up Chromosomes 67 •Topic: 6.1 Mitosis vs. Meiosis •Essential Questions: 1. Does mitosis or meiosis occur more frequently in your body? Explain. 2. Draw a double-bubble map comparing and contrasting mitosis and meiosis (pg. 67) Meiosis 6.1Ions, Mitosis vs. Meiosis 2.1 Atoms, and Molecules 1. 2. Does mitosis or meiosis occur more frequently in your body? Explain. Draw a double-bubble map comparing and contrasting mitosis and meiosis 6.1 Chromosomes and Meiosis • Mitosis= makes more diploid cells. • Produces genetically identical cells • Results in diploid cells (46 chromosomes each) • Takes place throughout an organism’s lifetime • Involved in asexual reproduction • Somatic (body) Cells 6.1 Chromosomes and Meiosis *Draw on pg. 74 DNA replicates 2 identical daughter cells 6.1 Chromosomes and Meiosis • Meiosis= makes haploid cells (23) from diploid germ cells (46). – produces gametes (sperm/eggs) – Produces genetically unique cells – Takes place only at certain times in an organism’s life cycle – Involved in sexual reproduction – Germ cells 6.1 Chromosomes and Meiosis (diploid- 46) Germ cell *Draw on pg. 74 4 haploid (23) unique daughter cells 6.1 Chromosomes and Meiosis Make a double-bubble Map comparing and contrasting mitosis and meiosis on Pg. 67. 6.1 Chromosomes and Meiosis Please open your book to page 172 • Please read the Genetic Data information • Interpret the second bar graph and answer the 3 questions on the bottom of pg. 74 • Title it “Genetic Data Chromosome Interpretation” 6.1 Chromosomes and Meiosis Diploid # of Chromosomes in Various Organisms Y- axis Dependent variable 10 20 40 40 49 55 210 X- axis Independent variable 6.1 Chromosomes and Meiosis 1. King crab; fruit fly 2. No. A porpoise is much bigger than a king crab, and has far less chromosomes. A potato is only 3 chromosomes off from human, and far smaller. 3. Yes. Chromosomes need to be able to fit in the nucleus. 6.1 Chromosomes and Meiosis Homework: Due by Friday11/08!!!! Work on vocab on pg. 68-69 of INB You need each vocab word- as well as a mini pic and description 6.1 • Sexual reproduction • Fertilization 6.3 • Meiosis • Traits • Genetics • Purebred 6.2 • Sperm • Egg 6.4 • Gene • Allele • Homozygous • Heterozygous • Genome • Genotype • Phenotype • Dominant • Recessive