Introduction to Meiosis 6.1 and 6.2 MA 2.7 Meiosis in sexual reproduction. Chapter 6 in the Big Black Book pages

*two page notebook format* Do Now: 1) What makes you who you are? 2) If you were looking at a couple who are expecting a child, what traits could you predict for the child just by observing the parents? 3) What is distinctive about sex cells (egg and sperm) compared to other cells in the body? Reading Toolbox – Comparisons page 157, do #1 and #2 Topic: Meiosis and Mendel Objectives, language objectives : Objectives, language objectives: Differentiate between body cells and gametes. Differentiate between body cells and gametes. Compare and contrast autosomes and sex chromosomes. Compare and contrast autosomes and sex chromosomes. Language Objectives: Use the terms body cells, gametes, autosomes, sex chromosomes, haploid, diploid, homologous chromosome, autosome, sex chromosome, sexual reproduction, gametogenesis, sperm, egg, polar body, and meiosis orally and in writing. Use parent cell and daughter cell in discussion. (all week) Page 53 Monday, Dec 15, 2014 Page 54

What makes you who you are?

If you were looking at a couple who are expecting a child, what traits could you predict for the child just by observing the parents?

What is distinctive about sex cells (egg and sperm) compared to other cells in the body?

Reading toolbox: comparisons p 157 Find the things that are being compared or contrasted: 1) Like mitosis, meiosis is a process that reproduces new cells. 2) In contrast to many other reptiles, the Burmese python does not reproduce sexually.

Body Cells and Gametes Your body cells are the cells of your body. Gametes are special cells used only for one purpose – sexual reproduction. These are the sperm and egg cells, which do no work at all towards the maintenance and function of your body. Gametes are special cells used only for one purpose – sexual reproduction. These are the sperm and egg cells, which do no work at all towards the maintenance and function of your body.

Your cells have autosomes and sex chromosomes. Predict: What do you think is the difference? Your cells have autosomes and sex chromosomes. Predict: What do you think is the difference? Autosomes Chromosomes that are NOT directly related to the sex of an organism. Homologous chromosomes are two chromosomes (one from each parent) that have the same size and the same genes on each. In people, chromosomes 1-22 are the autosomes. Sex Chromosomes The set of chromosomes that directly control the development of sexual characteristics. In humans and all mammals, the XY system determines sex. XX = female and XY = male. The X is larger and contains more genetic information. Y is smaller with fewer genes. The sex chromosomes are pair 23. (See figure 1.1 on page 159)

Body cells are diploid ; gametes are haploid compare Mitosis and Meiosis figure 1.2 page 161 Body cells are diploid; gametes are haploid compare Mitosis and Meiosis figure 1.2 page 161 Mitosis Work in pairs Answer “Compare” in notebook on left side Meiosis Use a T chart and illustrations Answer “Apply” in notebook on left side

6.2 Process of Meiosis: During meiosis, diploid cells undergo two divisions that result in haploid cells Meiosis I (page 164) What is the beginning point of Meiosis I? What is “reduced” in this part of “reduction division”? What is the result? Meiosis II (page 165) What is the beginning point of Meiosis II? What is “reduced” in this part of “reduction division”? What is the result? What is the major difference between Metaphase I and Metaphase II? Model – shoes activity

6.1 and 6.2 Formative Assessment Answer questions 1-5 on page 161. Answer questions 1-3 on page 166. SUMMARIZE what you learned today in 3-5 sentences Homework: Study Guide 6.1 and 6.2 – selected questions depending on today’s progress in class. If not done, complete cells Standards Based Assessment Quiz Review Greek and Latin word roots Make up take home Greek and Latin quiz if not taken in class

Genetics Project coming soon! A Sickeningly Sweet Baby Boy: A Case Study on Autosomal Recessive Inheritance