Activity 11.4 Let us explore to determine how many unique combinations of characters. Class 9
Activity 11.4 Let us explore to determine how many unique combinations of characters. Class 9
Activity 11.4 Let us explore
Aim: To determine how many unique combinations of characters can be carried by gametes.
Materials Required: Three pairs of beads( red, green, blue), Small cups or beakers to hold each pair.
Procedure:
1. Take three pairs of beads of different colours.
2. Each pair representing two contrasting characters on different chromatids of different chromosomes, such as:
- Pair 1 (green): One light green bead and one dark green bead representing blonde and black hair colour, respectively on different chromatids of chromosome 1.
- Pair 2 (blue): One light blue bead and one dark blue bead representing straight and curly hair, respectively on different chromatids of chromosome 2.
- Pair 3 (red): One light red bead and one dark red bead representing brown and black eye colour, respectively on different chromatids of chromosome.
3. Make a combination from it by randomly picking one bead from each pair.
4. Write your combination as ‘light green, light blue, light red’.
Observation: This random mixing provides many combinations, making children genetically different from their parents and also from their siblings.
Conclusion: Each of us receives a unique combination of chromosomes. This creates variation among individuals, which is important for the survival of a species.