1. MEIOSIS REVIEW

2. Meiosis – Stages (PMAT X 2)
Interphase – DNA Replication
Prophase 1
Metaphase 1
Anaphase 1
Telophase 1
Cytokinesis
2 Diploid Cells Created.
(no interphase)
Prophase II
Metaphase II
Anaphase II
Telophase II
Cytokineisis
Four HAPLOID Gametes created (goal)

3. Germ Cells (Parent Cell of Gametes) During Interphase DNA is duplicated to form sister chromatids and tetrads

4. Images Tetrads Separate in Meiosis 1
Sister Chromatids Separate in Meiosis 2 (II)
Tetrads Separate in Meiosis 1

5. Karyotype (picture of chromosomes)
22 Autosomes
(non-sex chromosomes)
2 Sex Chromosomes
Total – 23 Pairs or 46

6. Nondisjuntion
failure of one or more pairs of homologous chromosomes or sister chromatids to separate normally during meiosis
Causes Chromosomal Disorders

7. Examples Of Chromosomal Disorders
X= Turners Syndrome (females) XXY- Kleinfelters (MALES) Trisomy 18- Edwards Syndrome Trisomy 13- Patau Syndrome Trisomy 21- Down Syndrome

8. Which Chromosomal Disorder?

9. Symptoms Poor Muscle Tone Short Neck
Excess Skin at the back of the neck (nuchal crest)
Flattened facial profile and nose
Small head, ears, mouth
Upward slanting eyes