AP BIOLOGY

EVOLUTION

EVIDENCE FOR EVOLUTION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A scientist is studying the DNA of three species. Species A and species B have DNA that is 97% similar. Species C and species A have DNA that is 95% similar. What can the scientist conclude?
A
Species B is equally related to both species A and species C
B
Species B has a closer evolutionary relationship with species C than it does with species A
C
Species A has a closer evolutionary relationship with species B than it does with species C.
D
Species A has a closer evolutionary relationship with species C than it does with species B.
Explanation: 

Detailed explanation-1: -Species A and species B have DNA that is 97% similar. Species C and species A have DNA that is 95% similar. What can the scientist conclude? Species B is equally related to both species A and species C.

Detailed explanation-2: -Why do scientists use comparisons between fossils and existing species to classify organisms? Scientist use the evidence drawn from geology, fossils, and comparing body structure to form the basis for biological classification systems and the theory of evolution.

Detailed explanation-3: -Thus, DNA evidence confirms Darwin’s central hypothesis: that heritable variation arises continually and is gradually accumulated, making lineages steadily diverge from each other (though not necessarily at a constant rate).

Detailed explanation-4: -DNA and the genetic code reflect the shared ancestry of life. DNA comparisons can show how related species are. Biogeography. The global distribution of organisms and the unique features of island species reflect evolution and geological change.

Detailed explanation-5: -What type of evidence for evolution would arise from a comparison of the DNA sequence of humans and monkeys? DNA base sequences and amino acid sequences of proteins are compared in biochemical evidence for evolution.

There is 1 question to complete.