Fill in the blanks in the following paragraph regarding genome evolution. In your answer, separate the two missing phrases with a comma, e.g. protein, plasma membrane. Do not use abbreviations.
"Conservation of genomic sequences between humans and chickens is mainly due to … selection, whereas the conservation observed between humans and chimpanzees is mostly due to the short time available for mutations to accumulate. Even the DNA sequences at the … position of synonymous codons are nearly identical between humans and chimpanzees."

Question

Quizplus · Accepted Answer

Human and chimpanzee genomes are nearly identical, even in the third position of synonymous codons, where there is no functional constraint on the nucleotide sequence. This reflects the short time available for mutations to accumulate in the two closely related lineages. In contrast, the sequence conservation found between the genes of humans and chickens is almost entirely due to purifying selection.

Fill in the Blanks in the Following Paragraph Regarding Genome