Overview
Identify dominant/recessive characteristics. Infer that dominant characters mask the contribution of the recessive characters for the first generation (Fl). Recognise that the dominant characters become manifest in more individual members of a population than the recessive characters. Identify chromosomes in diagrams of cells. Note that chromosomes carry genes which are responsible for inherited characters: (a) Explain the advantages and disadvantages of: - Cross-fertilization and self-fertilization. - Sexual reproduction and asexual reproduction. - In and out-breeding. (b) Relate the application of the above to practices in agriculture and medicine.
What you'll learn
- Transmission and expression of characters in organisms:
- (i) Hereditary variations
- (ii) Characters that can be transmitted and how they are transmitted
- (iii) How characters manifest from generation to generation.
- Chromosomes, the basis of hereditary
- (i) Location
- (ii) Structure
- (iii) Role in and processes of transmission of hereditary characters from parents to offspring.
- Probability in genetics.
- Application of the principles of heredity:
- (i) In agriculture:
- - Improved varieties.
- - Diseases resistant. Varieties.
- (ii) In medicine advice for couples in relation to the sickle cell gene.
- Explain the terms:
- - Cross-fertilization
- - Self-fertilization.
- - Out and in-breeding using Mendelian crosses.