Ex.1 Which of the following statements regarding mutation rates is correct? a) Mutation rates are independent of gene size. b) Mutation rates for all genes of an organism are approximately the same. c) Mutation rates are independent of exposure to external agents such as UV radiation. d) Average mutation rates vary among taxonomic groups. Practice Problem 64 The amino acid changes noted in Parts A-C are the result of changes in DNA sequence. For each of these amino acid changes, evaluate whether a single base change in the given codons could account for the change in the amino acid. Part A For which codon(s) could a single base change account for this amino acid change? Lysine to Asparagine Select all that apply. UUU AAG AAA none of these codons Part B For which codon(s) could a single base change account for this amino acid change? Alanine to Phenylalanine Select all that apply. GCG GCU GCC GCA none of these codons Part C For which codon(s) could a single base change account for this amino acid change? Leucine to Glutamine Select all that apply. CUC UUG UUA CUG CUU CUA none of these codons

b) Mutation rates for allgenes of an organism are approximately the same.
Mutations result to certain adaptations, functional or behavioral adaptations refer to particular things that an organism or organisms do to survive. In the example above, behavioral adaptations that birds do is through certain bird calls and migration, while bears hunt during warmer seasons and hibernate during winter season.

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gradman555p98x9p gradman555p98x9p · Answer 2 · 2018-07-31T09:00:43+02:00

The right answer is Average mutation rates vary among taxonomic groups.

Some species defend themselves better than others against mutations, and this according to their ability to repair their DNA which varies. The more effective their repair is, the less they have mutations.

Part A:

The right answer is AAA and AAU

These two codons code for lysine, if a mutation is monitored at the third nucleotide transforming into AAC or AAU, there will be a change of amino acid from lysine to asparagine.

Part B:

The right answer is none of these.

Indeed these 4 GCA GCU GCG GCC codons code for alanine. Phenyl alanine is represented by UUU and UUC, so it is impossible to transition from alanine to phenylalanine by changing only one nucleotide.

Part C the right answer is CUA and CUG

These two codons code for leucine, if a mutation is monitored at the third nucleotide transforming into CAA or CAG, there will be a change of amino acid from leucine to glutamine.