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(C) Inbreeding refers to the mating of more closely related individuals within the same breed for $4-6$ generations. Continued inbreeding usually redu

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The fertility of the offspring decreases.

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(C) Inbreeding refers to the mating of more closely related individuals within the same breed for $4-6$ generations. Continued inbreeding usually reduces fertility and productivity. This is known as inbreeding depression. It occurs because inbreeding increases the homozygosity of harmful recessive genes,which are then expressed in the phenotype,leading to reduced biological fitness.

Due to the accumulation of harmful recessive genes in inbreeding,which of the following occurs?

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