Biology · Chromosomes and DNA

The correct answer is De novo mutation. These mutations occur in the germ cells or immediately after fertilization and are not inherited from the parents. The term 'de novo' means 'from the new', highlighting their origin as a new genetic change. Option A, 'New', is a general term and not specific enough. Option C, 'Drift', refers to genetic drift and not the type of mutation described. Option D incorrectly combines options that are not both correct.

A new mutation refers to a genetic change that arises in the germ cells (egg or sperm), but the more precise term for such mutations is 'de novo'. While all de novo mutations are new, not all new mutations are referred to as de novo in scientific terms.

De novo mutation specifically refers to a genetic change occurring in the germ cells (egg or sperm) or just after fertilization. These mutations are not inherited from the parents and can have various effects on the organism. The term 'de novo' translates to 'from the new'.

Drift refers to genetic drift, which is the random fluctuation of allele frequencies within a population. This is not related to mutations occurring in germ cells or early development.

While 'new' might describe the novelty of a mutation, 'de novo' is the scientifically accurate term for mutations occurring in germ cells or just after fertilization. Thus, only option (b) is correct.