Unit- I (B).pptx

laws of heredity

1. Laws of heredity & Methods of studying behavioural genetics

2. Introduction Explains the process and outcome of the mechanism of heredity transmission Law of similarity Law of variation Law of regression

3. Law of similarity

4. Similarity with parents Inheritance of intellectual potentials Works well for explaining the transfer of so many traits and characteristics from parents to offspring

5. Law of variation A/t this theory children may differ from their parents in relation to one or other traits The reason for variations lies in the characteristics of the germ cells of the parent Somatic cells- responsible for maintenance of bodily structure Germ cell contribute hereditary endowment No transmission of acquired traits, only the inherited traits will be transmitted

6. Law of regression Law of inheritance is governed by the phenomenon of regression The principle that inherited traits tend to revert toward the mean for the species For example, very tall fathers tend to have sons shorter than themselves but taller than the population mean, and very short fathers tend to have sons taller than themselves but shorter than the population mean

7. Methods of studying behavioural genetics

8. Beyond hair and eye colour how much are you shaped by your genetic inheritance or by your environment??????

9. Generally rely on the following methods Twin studies Adoption studies Family studies Genetic abnormalities

10. Twin studies

11. Adoption studies

12. Family studies

13. Genetic abnormalities Explores disorders and diseases that result when genes malfunction. Eg : Down’s syndrome, alzheimer’s disease etc.,