Hi Vaishaalie,
Recall the Hardy-Weinberg equilibrium equation: p^2 + 2pq + q^2 = 1, as this would help us determine if a population has undergone evolution or not. Based on my understanding, inbreeding increases the number of homozygous individuals in the population, which is an increase in genotype frequency (i.e. p^2, 2pq, and q^2) and not allele frequency (p and q). Usually the only way to change a population’s allele frequency is through a change in the organism’s alleles found on their chromosome (i.e. via a mutation, gene flow, or genetic drift). With inbreeding, there’s an increase in the proportion of homozygotes relative to heterozygotes, which doesn’t necessarily mean a change in the chromosome occurred. However, due to natural selection, the inbred population will eventually experience a allele frequency.
Hope these help!