The sum total of genes of all the individuals in a Mendelian population constitutes

Options

A. gene pool
B. gene flow
C. genetic drift
D. genotype

Answer

To solve the question, "The sum total of genes of all the individuals in a Mendelian population constitutes," we need to analyze the options provided and identify the correct term that describes this concept.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the term that represents the total collection of genes present in all individuals of a Mendelian population.

2. **Evaluating Option 1: Gene Pool**:
- The term "gene pool" refers to the complete set of genetic information within a population at a given time. It includes all the alleles for every gene present in the population.
- Since the question is about the total genes in a population, this option seems to fit perfectly.

3. **Evaluating Option 2: Gene Flow**:
- Gene flow refers to the transfer of genetic material between populations through migration. It does not represent the total genetic content of a single population but rather the movement of genes between different populations.
- Therefore, this option is incorrect.

4. **Evaluating Option 3: Genetic Drift**:
- Genetic drift is a mechanism of evolution that describes random changes in allele frequencies within a population. It does not refer to the total sum of genes but rather to the changes in gene frequencies over time.
- Thus, this option is also incorrect.

5. **Evaluating Option 4: Genotype**:
- Genotype refers to the genetic constitution of an individual organism. It represents the specific alleles present in an individual, not the total sum of genes in a population.
- Therefore, this option is incorrect as well.

6. **Conclusion**: After evaluating all the options, the correct answer is **Option 1: Gene Pool**, as it accurately defines the sum total of genes in a Mendelian population.

### Final Answer:
The sum total of genes of all the individuals in a Mendelian population constitutes the **Gene Pool**.

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