A bacterial culture is heated up, resulting in protein denaturation and loss of protein function, including proteins necessary for metabolism of certain nutrients. The cellular DNA remains intact and unchanged. O Genotypic Change Only O Phenotypic Change Only O Both Genotypic and Phenotypic Changes O Neither Genotypic nor Phenotypic Change

"Mutations that are inherited according to Mendelian rules affect nuclear genes; mutations whose inheritance violates Mendelian rules are likely to affect organelle genes." is true or false.

Null mutations are valuable genetic resources becausethey allow a researcher to determine what happens to anorganism in the complete absence of a particular protein. However, it is often not a trivial matter to determinewhether a mutation represents the null state of the gene.a. Geneticists sometimes use the following test forthe nullness of an allele in a diploid organism: If theabnormal phenotype seen in a homozygote for theallele is identical to that seen in a heterozygote(where one chromosome carries the allele in question and the homologous chromosome is known tobe completely deleted for the gene) then the alleleis null. What is the underlying rationale for thistest? What limitations might there be in interpreting such a result?b. Can you think of other methods to determinewhether an allele represents the null state of a particular gene?

In Anopheline mosquitoes an inversion associated with resistance to desiccation involves the centromere. These inversions are _______.