Welcome great EduPodian, here is your Second Term SS3 Biology Lesson Note excerpt.
Scheme of Work
WEEK ONE…HEREDITY(GENETICS)
WEEK TWO/……THE CHROMOSOME
WEEK THREE……/VARIATON AND EVOLUTION
WEEK FOUR……ADAPTATIONS
WEEK FIVE……DIFFERENT CASTSES OF TERMITES AND THEIR ROLES
WEEK SIX……THEORY OF EVOLUTIOS
Week 1:
Genetic is the study of heredity and variation in living things
HEREDITY OR INHERITANCE is defined as the transmission and expression of characteristics or traits in an organism from parents to offspring.
VARIATION is defined as… Click here to order the complete Biology Lesson Note for SS3 second term
Week 2:
CHROMOSOME (Basic of Heredity)
Chromosomes are thread like structure that occur in the nuclear of plants and animals and carry heredity information from generation to generation.
There are seen only during nuclear division and occur in identical pair called homologous pair. The body cell (somatic) of man has 46 chromosomes (23pairs). The sex cell (sperm, ovum) have 23 chromosomes. The 23pairs of chromosomes are called diploid number (2N) and 23 chromosomes are referred is as haploid number (N).chromosome are made up of two threads ‘chromatids’. Chromosome carry genes that are hereditary unit for inherited traits
Structure of chromosome:
During the early cell division chromosome become condensed and visible, each, then ,duplicate or replicate to produce a compact twins connected by a centromere. Each member of a bond pair is called a chromatid which… Click here to order the complete second term Biology Lesson Note for SS3
Week 3:
VARIATION IN POPULATION
Variation can be defined as the differences that occur between individual or organisms of the same species. Variation is caused majorly by
i. Genetic of differences or genotypic variation
ii. Effect of environmental factor.
The genetic differences or genotypic variation may be as a result of new genetic combination which occur during sexual reproduction or due to mutation, a rare and spontaneous alteration that occur in genes or chromosome. This type of… Click here to order the complete Lesson Note on Biology SS3 second term
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