'Same genes' diaporamas de présentation

Mechanisms of Evolution

Mechanisms of Evolution. Changing the frequencies of genes in populations Reading: Chapter 15.2. Genes. The basic unit of heredity in a living organism. Gene or Allele Frequency. Proportion of genes/alleles in a population that are of a particular type

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Unit 8: The Cell Cycle

Unit 8: The Cell Cycle. Why do Cells Divide? . To make copies of cells for growth (you started out as 1 cell, today you have around 10 trillion) . Why do cells divide?. To make copies of cells for repair (cells wear out and need to be replaced). Why do cells divide? .

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Add to your Table of Contents Record #6. SRA Science Reading Laboratory, 2nd Quarter Selections

Add to your Table of Contents Record #6. SRA Science Reading Laboratory, 2nd Quarter Selections Record #7. SLI Activity 57: Copycat Record #8. Guided Notes for Protists Four ppt (revisited) Record #9. Act. 57 Copycat (Reproduction) Record #10. DNA Secret of Life (DNA Video Questions)

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Unit 8 Nature and Nurture

Unit 8 Nature and Nurture. Students will be able to: know something about Nature & Nurture ; grasp the main idea and structure of the text; master the key language points and grammatical structures in the text;

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Meiosis

Meiosis . Sexual Division of Cells. Gamete vs. Zygote. What is a Gamete? Egg & Sperm . What is a Zygote? When two gametes come together (fertilization). Why your body can not use mitosis to make sperm or eggs?.

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MEIOSIS

MEIOSIS. 4.2. Key Concepts. Gametes have half the number of chromosomes that body cells have. During meiosis, diploid cells undergo two cell divisions that result in haploid cells. Haploid and Diploid. The cells which contain two of each type of chromosome are called diploid.

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November 12 th , 2013

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Chapter 18 Organizing Information About Species

Chapter 18 Organizing Information About Species. The Hawaiian Honeycreepers. By 1778 at least 43 honeycreeper species that had thrived on the Hawaiian islands before humans arrived were extinct

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Parents can produce many types of offspring

Parents can produce many types of offspring . Families will have resemblances, but no two are exactly alike. Why is that?. Meiosis and Genetic Linkage. Objectives. Recognize the significance of meiosis to sexual reproduction (TEKS 6G)

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Control of Eukaryotic Genes

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Chapter 8: Meiosis

Chapter 8: Meiosis. Production of Sex Cells. Introduction. Mitosis and Meiosis are somewhat similar, but have 2 completely different goals.

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DNA Structure

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Meiosis

Meiosis. Gamete Formation. Vocabulary. Gametes = sex cells (eggs, sperm) Homologous chromosomes = paired chromosomes (maternal and paternal) that have the same genes Haploid = Having only one copy of each chromosome (as opposed to diploid , which has two copies of each).

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Meiosis

Meiosis. Vocabulary. 1. Parent cell: original cell before division 2. Daughter cell: cells after division 3. Gamete/sex cell: eggs and sperm 4. Somatic cell: all other body cells besides eggs and sperm 5. Haploid (n): one set of unique chromosomes

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Sex-Linked Inheritance

Sex-Linked Inheritance. Recall: Homologous pairs. Humans have 23 pairs of chromosomes Each homologous pair contains the same genes, but possibly different alleles 22 pairs of autosomes 1 pair of sex chromosomes In males X and Y form a homologous pair but they do not contain the same g enes.

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3.8 Sexual Reproduction and the Diversity of Life

3.8 Sexual Reproduction and the Diversity of Life. (Sec 3.2 pg.79). The production of gametes is only the first step in sexual reproduction. They must combine to form a diploid cell.

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Meiosis and Sexual Reproduction

Meiosis and Sexual Reproduction. Why Meiosis?. Advantages : Dramatic increase in genetic variation Keeps genetic material from multiplying ( ploidy ) R eplication done with somatic cells ( body cells ) would double the amount of DNA each time Disadvantages :

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Genetics Problem Solving

Genetics Problem Solving. How do you solve a genetics problem?. Draw the steps in the correct order. What do the letters outside the Punnett Square stand for?. These are the gametes. What do the letters inside each square stand for?. These are possible zygotes.

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The Taste of Cats

By: Nidal Babaa Bsci338C Dr. Carleton. The Taste of Cats. The pleasant tastes are mediated by a family of three T1R receptors that assemble in pairs. Diverse molecules that lead to a sensation of sweet bind to a receptor formed from T1R2 and T1R3 subunits .

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Meiosis

Meiosis. Gamete Formation. Major Events in Meiosis. Vocabulary. Gametes = sex cells (eggs, sperm) Homologous chromosomes = paired chromosomes (maternal and paternal) that have the same genes

204 views • 6 slides