pearls bio perak state
DESCRIPTION
PEARLS Seminar (Perak State) in Penang,2007TRANSCRIPT
PEDAGOGY ENHANCEMENT AND REINFORCEMENT OF LEARNING STRATEGIES (PEARLS)
BIOLOGYCell Division
CASE - Cell division
BACKGROUND Cell division is one of the popular topics frequently
asked in examinations. But students usually encounter difficulties in tackling the question correctly.
When teaching mitosis and meiosis , students always get confused between chromatin , chromatids and chromosomes. They tend to use incorrect terms for describing different forms of chromosome.
Students are also facing problem to count the chromosomal number in the cell especially in meiosis.
DISCUSSION
How to solve the problems?
Suggestion 4 solutions
Solution 1
Show the diagrams and explain the structure of chromatin, chromatid and chromosome so that the students are able to differentiate their structure.
1. Using different stages of mitosis and meiosis to show the location of chromatin, chromatid and chromosome.
2. Students are also explained that chromatid are also known as chromosome at the end of mitosis and meiosis.
Solution 2
Mitosis
Telophase
Prophase Metaphase
Anaphase
Meiosis
Anaphase 1Metaphase 1Prophase 1 Telophase 1
Meiosis
Anaphase 2Metaphase 2Prophase 2 Telophase 2
Students are given several diagrams of different stages mitosis and meiosis and they
are asked to determine diploid and haploid number of chromosomes.
Solution 3
2n = ______
n = ______
2n = ______
n = ______
2n = ______
n = ______
2n = ______
n = ______
Solution 4
Solution 4 Using models in explaining the structure of
chromosome Suggested materials: Marble,two colours of plasticine,manila card Procedure:
1. Students are asked to work in pairs.2. Student are asked to use two different colours of plasticine to form cylinder-shaped structure.3. Both cylinders are then crossed together and the marble is put at the crossing point.4. Place the model on the manila card to be displayed to other students.
Conclusion
All the four solutions given are subjective. It depends on students’ capabilities and can
be altered. Teachers can use different solution to different sets of student and situation.
Teachers may develop and elaborate the ideas of the solution according to teacher’s creativity.