Download II. Purpose of Meiosis #1

Meiosis and Sexual Reproduction
Why you are unique
Outline
This outline is the same as is found in your Lecture Guide. In order to obtain an overview of the
material in the Lecture Guide and to be able to see the ‘big’ picture while you study, fill in the
missing components of the following outline from the Lecture Guide.
I.
Introduction
A.
Karyotype
1.
Replicated Chromosomes= Sister Chromatids
2.
Sister Chromatids vs.
B.
Gametes vs.
C.
Diploid vs.
1.
2.
Diploid
a)
Homozygous vs.
b)
Human somatic cells remain diploid after
Haploid
1
D.
Functions of Meiosis
1.
2.
II.
Purpose of Meiosis #1:
A.
B.
C.
Initial cell in the ovaries or testes:
1.
1. Diploid or Haploid?
2.
Are the Chromosomes Replicated or Unreplicated?
What does REPLICATED and UNREPLICATED that mean?
3.
Total Number of Chromosomes?
4.
Number of copies each gene on all of the chromosomes?
The Two Cells after Meiosis I:
1.
1. Diploid or Haploid?
2.
Are the Chromosomes Replicated or Unreplicated?
3.
Total Number of Chromosomes?
4.
Number of copies each gene on all of the chromosomes?
The Four Cells after Meiosis II:
1.
1. Diploid or Haploid?
2.
Are the Chromosomes Replicated or Unreplicated?
3.
Total Number of Chromosomes?
4.
Number of copies each gene on all of the chromosomes?
2
III.
Purpose of Meiosis #2:
A.
Meiosis I
1.
Prophase I
a.
b.
c.
d.
2.
Metaphase
a.
b.
c.
d.
3.
4.
B.
Meiosis II
1.
Prophase II
2.
Metaphase II
3.
4.
3
IV.
V.
Summary: Genetic Variability Due To Meiosis and Sexual
Reproduction
A.
Crossing Over
B.
Independent Assortment (What does this mean?)
C.
D.
4
II. Overview of meiosis
A. Before Meiosis
1. Total number of chromosomes?
2. Homologous Pairs? (Diploid? Haploid?)
3. Number of copies of each gene?
B. After Meiosis I
1. Total number of chromosomes?
2. Homologous Pairs? (Diploid? Haploid?)
3. Number of copies of each gene?
C. After Meiosis II
1. Total number of chromosomes?
2. Homologous Pairs? (Diploid? Haploid?)
3. Number of copies of each gene?
D. After Fertilization
1. Total number of chromosomes?
2. Homologous Pairs? (Diploid? Haploid?)
3. Number of copies of each gene?
III. Stages of meiosis
A. Meiosis I
5
1.
2.
3.
4.
B. Meiosis II
1.
2.
3.
4.
IV. Fertilization
V. Genetic variability due to meiosis and sexual reproduction
A.
6
B.
C.
D.
7
8