When two genes from two different people are sequenced and aligned, it is discovered that there are multiple sequence difference
s in the coding segment DNA level. However, when the proteins formed by the genes have their amino acids sequenced, there is no difference observed between the two. What is the most likely explanation for this observation? a. The mutations are repaired at the mRNA level after transcription has occurred, but before translation.
b. RNA processing removes the different segments from the mRNA molecules of each person prior to translation.
c. The mutations lie at locations where they don't affect protein sequence due to degeneracy of the genetic code.
d. Mutations at the DNA level are not reflected in proteins produced.
e. The mutations are corrected at the protein level after translation has occurred.
The mutations lie at locations where they don't affect protein sequence due to degeneracy of the genetic code.
Explanation:
Genetic code is the set of the triplet codons each of which code for a specific amino acid. The nucleotide sequence of mRNA is read in the form of triplets during the process of protein synthesis and the respective amino acid is added to the growing polypeptide chain. The genetic code is degenerate. This means that more than one triplet code specifies one amino acid and some amino acids are encoded by more than one codon.
For instance, genetic codes CUU, CUC, CUA, CUG specify amino acid "leucine". Therefore, any change in the DNA sequence that replaces one code for the leucine with another would not affect the amino acid composition of the protein. This would result in the synthesis of proteins with the same amino acid sequence from both the wild type and mutated genes.
Four factors believed to cause microevolution are natural selection, mutation, gene drift and gene flow (migration). Many occurrences of these four factors result in macroevolution. 3. The allele frequency of genes in a population that has undergone microevolution slightly change.Explanation:
Scientists often use models because the real thing many be to dangerous or impossible to work with. The most important that model helps better then visualization and you can see it right in front of your eyes.
Water molecules exhibit a property which enables them to stick to each other and it is <span>Cohesion</span><span> which is due to intermolecular forces London dispersion and dipole dipole attraction
Evolution reflects the adaptations of organisms to their changing environments and can result in altered genes, novel traits, and new species. One mechanism that drives evolution is natural selection, which is a process that increases the frequency of advantageous alleles in a population.
