Transcript 6.1-6.2 Meiosis Introx

Introduction to Meiosis 6.1 and 6.2
MA 2.7 Meiosis in sexual reproduction.
Chapter 6 in the Big Black Book pages 156-183
*two page notebook format*
Page 53
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
Monday, Dec 15, 2014 Page 54
Topic: Meiosis and Mendel
Objectives, language objectives:
Differentiate between body cells and
gametes.
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)
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.
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
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)
Meiosis II (page 165)
What is the beginning point
of Meiosis I?
What is the beginning point
of Meiosis II?
What is “reduced” in this
part of “reduction division”?
What is “reduced” in this
part of “reduction division”?
What is the result?
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