Four vertebrate forelimbs are shown.
In which area of study do these forelimbs support the theory of evolution?
- Biogeography
- Comparative anatomy
- Comparative embryology
- Palaeontology
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Four vertebrate forelimbs are shown.
In which area of study do these forelimbs support the theory of evolution?
\(B\)
→ Comparative anatomy is the practise of comparing body structures of different species.
→ In this example we see how across vertebrate species there are similar forelimb structures, suggesting divergence from a common ancestor.
\(\Rightarrow B\)
Justify the use of vertebrate forelimbs as evidence to support the theory of evolution. (3 marks) --- 7 WORK AREA LINES (style=lined) --- → Vertebrate forelimbs exhibit a shared structure across species, suggesting common ancestry. → Despite varying functions and appearances, the five-fingered bone structure remains consistent. → The transition from fins to limbs in early tetrapods further supports evolution as these transitions reveal functional stages in limb development. → By comparing the limbs of vertebrate we are presented with compelling evidence to support the theory of evolution. → Vertebrate forelimbs exhibit a shared structure across species, suggesting common ancestry. → Despite varying functions and appearances, the five-fingered bone structure remains consistent. → The transition from fins to limbs in early tetrapods further supports evolution as these transitions reveal functional stages in limb development. → By comparing the limbs of vertebrate we are presented with compelling evidence to support the theory of evolution.
Explain how ONE secondary source has provided support for the theory of evolution. (4 marks)
--- 10 WORK AREA LINES (style=lined) ---
→ The theory of evolution suggests that species occur by variation of a common ancestor.
→ Variation within an ancient species caused certain characteristics to be favoured in certain environments, causing divergent evolution and overtime the development of new species.
→ This theory can be validated by comparative anatomy, the practise of comparing body structures of different species.
→ When comparing forelimbs of vertebrate, such as canines, humans and whales, we are presented with similarities in their structures. The bone structure is especially similar, with the named animals all having the same pentadactyl (five-digit) limb plan, as they all possess some form of humerus, ulna, radius, carpels and metacarpals. This suggests common ancestry.
→ The theory of evolution suggests that species occur by variation of a common ancestor.
→ Variation within an ancient species caused certain characteristics to be favoured in certain environments, causing divergent evolution and overtime the development of new species.
→ This theory can be validated by comparative anatomy, the practise of comparing body structures of different species.
→ When comparing forelimbs of vertebrate, such as canines, humans and whales, we are presented with similarities in their structures. The bone structure is especially similar, with the named animals all having the same pentadactyl (five-digit) limb plan, as they all possess some form of humerus, ulna, radius, carpels and metacarpals. This suggests common ancestry.