Inbreeding depression is

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reduced fertility and productivity due to continued close inbreeding

reduced motility and immunity due to close inbreeding

decreased productivity due to mating of superior male and inferior female

decrease in body mass of progeny due to continued close inbreeding

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Detailed Solution

When individuals who are closely related mate with each other over multiple generations, it increases the chances of inheriting harmful recessive alleles from both parents. This accumulation of deleterious genetic traits can lead to a decline in fertility and overall productivity of the population.

(2) Inbreeding does not reduce motility or immunity.

(3) Decreased fitness or productivity due to crossing of genetically distant populations is termed outbreeding
depression.

(4) Though inbreeding depression can lead to reduced fitness and negative effects on various traits, it is not specifically associated with a decrease in body mass.

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