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(A) Inbreeding refers to the mating of more closely related individuals within the same breed for $4-6$ generations. Continuous inbreeding increases h

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Due to continuous inbreeding

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(A) Inbreeding refers to the mating of more closely related individuals within the same breed for $4-6$ generations. Continuous inbreeding increases homozygosity. This process exposes harmful recessive genes that are eliminated by selection. However,if inbreeding is continued without selection,it leads to inbreeding depression,which reduces fertility and productivity,as harmful recessive alleles accumulate in the homozygous state.

Column $X$	Column $Y$
$(1)$ Cross-breeding	$(P)$ Mating between superior male of one breed and superior female of another breed
$(2)$ Out-crossing	$(Q)$ Mating between animals within the same breed
$(3)$ Interspecific hybridization	$(R)$ Mating between male and female of two different species

When does the possibility of accumulation of harmful recessive genes increase?

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