Answer:
Answer is C.
Explanation:
For A and B, a base substitution affects one of the three bases that comprise a codon, the DNA/RNA unit that corresponds to a particular amino acid. If one base is substituted, one codon and therefore one amino acid will be affected. Codons have built-in redundancy, so even by changing one base, the new codon sometimes still corresponds to the same amino acid. Therefore, a base substitution at most affects one amino acid, and sometimes doesn't affect it all.
Frameshift mutations cause a lot more trouble. These occur when you have a deletion or insertion that changes the number of bases in your gene. As a result, the "frame" of the codons changes (everything shifts one way or the other by the number of bases added/removed). This affects EVERY codon downstream of the mutation, so you can imagine that such a mutation would have a bigger effect the closer to the start of the gene it occurs. This is why C is correct.
The reason why Koala bears are restricted to live in a
certain habitat is because they can only eat a certain type of eucalyptus leaf.
These bears are indigenous to Australia. They are nocturnal and live in tropical
where temperate eucalyptus forest can be found.
Answer:
They have homologous structures because they have a common ancestor.
Answer:
B.
Explanation:
B. carbon decays relatively quickly.
