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AP Biology 7.6.B: Morphological, Biochemical and Geological Evidence

Practise AP Biology 7.6.B questions by comparing fossil, geological, morphological, DNA and protein evidence for evolutionary change and common ancestry.

Syllabus
Effective Fall 2025
Course
AP Biology

Exam points

  • use rock layers, isotope decay or geographical context to place fossils and evolutionary events in time
  • identify homologous, vestigial or transitional structures as evidence of common ancestry
  • compare DNA nucleotide or protein amino-acid sequences to infer evolutionary relatedness and conserved change

7.6.B—Explain how morphological, biochemical, and geological data provide evidence that organisms have changed over time question 1

[Maximum number: 1]

Scientists are interested in determining the evolution of seven lizard species found on different islands of the Canary Island group. They isolated DNA from individuals of each species and sequenced the mitochondrial gene that encodes cytochrome b. The numbers of genetic differences between species are shown in the table below.

Table for Question 7.6.B—Explain how morphological, biochemical, and geological data provide evidence that organisms have changed over time question 1 — AP Biology

Based on the data in the table, which of the following lizard species are most closely related?

Figure 1. A model of an endocrine signaling pathway showing involved body parts and hormones. GnRH = gonadotropin-releasing hormone, LH = luteinizing hormone, and FSH = follicle-stimulating hormone.

Figure 1. A model of an endocrine signaling pathway showing involved body parts and hormones. GnRH = gonadotropin-releasing hormone, LH = luteinizing hormone, and FSH = follicle-stimulating hormone.

A

Species C and species B

B

Species E and species D

C

Species F and species B

D

Species G and species A

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