1. Meiosis: An Overview Assume that an organism has: 1 Homologous Pair =
2 Chromosomes
(Diploid cell – 2n)
STEP 1: Each of the chromosomes is replicated in Interphase
STEP 2: Chromosome pairs of copies separate in Meiosis I
(Haploid cell – n)
BUT 2 copies of each one
STEP 3: Each of the copies (sister chromatids) in a cell separates creating 4 haploid cells
(Haploid cell with only 1 copy)

2. Repeat the Diagram but with 4 Chromosomes
The cell before interphase has 4 chromosomes and is diploid
Indicate how many chromosomes are present:
1. After interphase but before Meiosis
2. After Meiosis I
3. After Meiosis II

3. Repeat the Diagram but with 4 Chromosomes ANSWERS
The cell before interphase has 4 chromosomes and is diploid
Indicate how many chromosomes are present:
1. After interphase but before Meiosis – Equal to 8 chromatids
2. After Meiosis I
-- 4 chromosomes
-- 2 Cells of 2 chromsomes (4 chromatids each cell) (haploid)
3. After Meiosis II
-- 8 chromosomes
-- 4 cells of 2 chromosomes (2 chromatids per cell) (haploid)

4. Questions?
If a cell has 10 chromosomes and is diploid, how many chromosomes (include what the book calls chromatids) are found at:
A) the end of Meoisis I
B) the end of Meiosis II

5. Questions? ANSWERS
If a cell has 10 chromosomes and is diploid, how many chromosomes (include what the book calls chromatids) are found at:
A) the end of Meoisis I
-- 10 chromosomes (2 cells of 5 chromosomes)
-- 20 chromatids (2 cells of 10 chromatids)
B) the end of Meiosis II
-- 20 chromosomes (4 cells of 5 chromosomes)