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
1. Law of similarity
2. Law of variation
3. 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

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
1. Twin studies
2. Adoption studies
3. Family studies
4. Genetic abnormalities

10. Twin studies

12. Adoption studies

13. Family studies

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