Genetics is the study of Heredity. Heredity deals with the transmissions of characteristics from one generation to another.
Observable differences within a species are called variations. There arte two types of variations.
(a) Continuous variations. Observable differences within a species with intermediate forms are called continuous variations. E.g. height of students in a class, intelligence of students, Skin color. This is due to the result of two factors.
- The genes that are inherited by an individual.
- The effect of environment on the individual organisms.
The environmental factors are
a) The availability and type of food.
c) The climate – amount of sunlight, temperature, amount of water etc.
d) The ions present in the soil
e) Inter and intra specific competition.
(b) Discontinuous variation. Observable differences with in a species with out intermediate forms. Example. a tongue roller or a non-roller, horned cattle or hornless, blood groups, gender etc. This is due to the inheritance only and the environmental factors have no influence on it.