Asingle zebrafish gene function was inactivated completely by mutation, and a zebrafish with this mutation had none of its normal horizontal stripes. for each of the following statements, indicate whether the statement is certainly true, certainly untrue or if there is insufficient information to decide. a. the normal gene function is required for the viability of the zebrafish. b. the normal gene function is required for the formation of stripes. c. the normal gene function is required to make the pigment deposited in the stripes. d. the gene is required in zebrafish only for stripe formation.

a. The normal gene function is required for the viability of the zebrafish.

Explanation:

It is mentioned that if the gene responsible for forming stripes on its body is inactivated by mutation then fish without stripes will produced.

This will lead to the absence of phenotypic character that is strips on the fish. The other genes which are responsible for the survival of the fish will function normally thus this will be untrue that normal functioning of the gene required for expressing horizontal strips is also necessary for the survival and viability of the zebrafish.

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