The correct Option is : 1
Step 1: Definition of gene pool.
The gene pool is the total set of genetic material, including all alleles for all loci, within a population or species. It represents the diversity of genes available for inheritance.
Step 2: Explanation of other terms.
Genetic drift: Refers to random changes in allele frequencies in a population.
Gene frequency: Refers to the proportion of a specific allele in the gene pool.
Gene mutation: Refers to a permanent change in the DNA sequence of a gene. \[ \therefore \text{The correct answer is: Gene pool.} \]
Expressed Sequence Tags (ESTs) refers to
Given, the function \( f(x) = \frac{a^x + a^{-x}}{2} \) (\( a > 2 \)), then \( f(x+y) + f(x-y) \) is equal to