The correct option is A i - Characters are passed on from parent to offspring, ii - Degree by which progeny differ from their parents.
Genetics is the branch of biology that deals with the study of inheritance and variations.
Inheritance refers to the process by which parents pass on their characters to progeny. This forms the basis of heredity.
On the other hand, when the characters are being passed on to the progeny they are slightly changed. The reason behind it is sexual reproduction where the offspring receives genes from two different parents. Hence, we can say variation is the degree of extent by which the offspring differs from its parents.