Page 57 - SUBSEC October 2017_Neat

UNIT 1
MODULE 2: GENETICS, VARIATION AND NATURAL SELECTION (cont’d)

SPECIFIC OBJECTIVES EXPLANATORY NOTES SUGGESTED PRACTICAL
ACTIVITIES

Cell Division and Variation (cont’d)

Students should be able to:

2.5. describe with the aid of Students should be Construct models to
diagrams, the processes familiar with the terms: demonstrate
involved in meiotic cell homologous chromosome behaviour in
division; chromosomes, haploid meiosis. Pipe cleaners,
and diploid. Inclusion of plastic wire, embroidery
crossing over, alignment thread, Bristol board may
of chromosomes at be used for modelling
metaphase, random chromosome behaviour in
segregation at anaphase. meiosis – biodegradable
Names of the materials not
intermediate stages of recommended.
meiosis not required.

2.6. discuss how meiosis Comparison with the Use prepared slides of
contributes to heritable process of mitosis. testes and/or anther to
variation; demonstrate the stages of
meiosis.

2.7. explain why sexually
produced organisms vary
in characteristics;

2.8. describe gene and Include the types of gene
chromosome mutations; and chromosome
mutations.
2.9. discuss the implications
of changes in DNA
nucleotide sequence for
cell structure and function
in sickle cell anaemia;

2.10. explain how mutation Not limited to: sickle-cell
brings about genetic anaemia, cystic fibrosis,
variation; and, PKU and Down Syndrome.

2.11. explain why heritable
variation is important to
selection.

CXC A10/U2/17
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