To solve this problem, we need to identify which option is NOT an advantage of inbreeding. Let's analyze each option:$\newline \bullet$Option 1: It decreases homozygosity.$\newline$ - Inbreeding actually increases homozygosity, as it involves breeding between closely related individuals, leading to a higher chance of offspring inheriting the same alleles from both parents.$\newline$ - Therefore, this statement is incorrect as an advantage of inbreeding.$\newline \bullet$Option 2: It exposes harmful recessive genes that are eliminated by selection.$\newline$ - Inbreeding can indeed expose harmful recessive alleles, allowing them to be identified and potentially eliminated through selection.$\newline$ - This is considered an advantage of inbreeding.$\newline \bullet$Option 3: Elimination of less desirable genes and accumulation of superior genes takes place due to it.$\newline$ - Inbreeding can lead to the elimination of less desirable genes and the accumulation of superior genes through selective breeding.$\newline$ - This is also considered an advantage of inbreeding.$\newline \bullet$Option 4: It decreases the productivity of inbred population after continuous inbreeding.$\newline$ - Continuous inbreeding can lead to inbreeding depression, which decreases the overall productivity and fitness of the population.$\newline$ - This is NOT an advantage of inbreeding, but rather a disadvantage.$\newline$Therefore, the correct answer is Option 4, as it is NOT an advantage of inbreeding.