Answer:
The statement which is correct is
<em>The evolutionary fitness associated with the heritable trait of DDT resistance changed once DDT use became widespread.</em>
Explanation:
In the 1930's, the usage if insecticides was minimal. Hence, the genes for DDT resistance were absent or silent in the fruit flies at that time.
In the 1960's, the DDT resistant forms of fruit fly began occurring at this rate because they were better adapted to survive. According to Darwin, the species which are better able to adapt to the environment survive and are able to reproduce. Hence, with the passage of time the resistant forms of fruit fly will keep reproducing and increase in number.
Answer:
The correct answer is - substitution.
Explanation:
Substitution mutations are the point mutations that are the mutations that least likely affect the trait of an organism or have no effect at all. Substitution mutations take place when there is only one nucleotide base is substituted by another nucleotide base in the DNA or RNA of an organism's genome.
In this case, there is no effect found on the protein formed by these DNA sequences. These substitution mutations generally found in somatic cells and have little to no effect at all.
The enzyme maltase breaks down disaccharide maltose into simple sugar glucose, which is usable by the body. This glucose can now also be stored in the liver for future use.
This maltase does nor break down sugar sucrose because it is the sucrase enzyme that breaks down sucrose into glucose and fructose.
Answer:
An anticodon is a trinucleotide sequence complementary to that of a corresponding codon in a messenger RNA (mRNA) sequence. An anticodon is found at one end of a transfer RNA (tRNA) molecule.
Explanation:
