Select the incorrect statement(s): | vedclass

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(C) Linked genes do not cause absolute lethality; they simply tend to be inherited together.$(B)$ Phenylketonuria $(PKU)$ is an inborn error of metabo

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$(A), (B) \; \& \; (D)$

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(C) Linked genes do not cause absolute lethality; they simply tend to be inherited together.$(B)$ Phenylketonuria $(PKU)$ is an inborn error of metabolism that results in mental retardation if untreated.$(C)$ In both codominance and incomplete dominance,the $F_{2}$ phenotypic and genotypic ratios are identical $(1:2:1)$.$(D)$ In $Drosophila$,the sex is determined by the ratio of $X$-chromosomes to autosomes,not by the presence of the $Y$-chromosome (which is required for male fertility but not for sex determination).Since statements $(A)$,$(B)$,and $(D)$ are incorrect,the correct option is $(C)$.

Select the incorrect statement$(s)$:

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