Select the incorrect statement w.rt phenetics

Options

A. Numbers and codes are assigned to all observable characters
B. All observable characters are given equal Importance considering sexual characters on the topmost priority
C. Organisation and analysis of data forms core of numerical taxonomy
D. Notations like '0', + and - are used for data not available, presence and absence of character respectively

Answer

To solve the question regarding the incorrect statement with respect to phenetics, we will analyze each of the provided options step by step.

### Step 1: Understanding Phenetics
Phenetics is a classification system that groups organisms based on their observable similarities, which can include morphological, anatomical, and molecular characteristics. This classification does not prioritize any specific type of character over others.

**Hint:** Remember that phenetics focuses on observable characteristics and does not prioritize sexual characteristics.

### Step 2: Analyzing Option 1
The first option states: "Numbers and codes are assigned to all observable characters." This is true because, in phenetics, assigning numerical values or codes to characters helps in organizing and analyzing data for classification.

**Hint:** Think about how data organization aids in classification.

### Step 3: Analyzing Option 2
The second option states: "All observable characters are given equal importance considering sexual characters on the topmost priority." This statement is incorrect. In phenetics, while all observable characters are considered, there is no special emphasis placed on sexual characters over others. Instead, various types of characters (molecular, phenotypic, anatomical) are treated equally.

**Hint:** Consider whether sexual characteristics are prioritized in phenetic classification.

### Step 4: Analyzing Option 3
The third option states: "Organization and analysis of data forms the core of numerical taxonomy." This is true. Numerical taxonomy is indeed centered around the systematic organization and analysis of data, which is a key aspect of phenetics.

**Hint:** Recall the importance of data analysis in classification systems.

### Step 5: Analyzing Option 4
The fourth option states: "Notations like zero, plus and minus are used for data not available, presence and absence of characters respectively." This is also true. In phenetics, these notations are commonly used to represent the presence (plus), absence (minus), or unavailability (zero) of certain characters.

**Hint:** Think about how symbols are used in data representation.

### Conclusion
After analyzing all the options, the incorrect statement regarding phenetics is option 2: "All observable characters are given equal importance considering sexual characters on the topmost priority."

**Final Answer:** Option 2 is the incorrect statement with respect to phenetics.