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Zorluk: OrtaEvidence for Evolution: Comparative Biochemistry and Biogeography

In a comparative biochemical experiment, anti-human serum antibodies are introduced into serum samples taken from chimpanzees, baboons, and dogs. The percentage of protein precipitation formed is found to be highest in chimpanzees, moderate in baboons, and lowest in dogs. Which of the following conclusions is best supported by this comparative biochemical evidence?

  1. Humans share a more recent common ancestor with chimpanzees than with baboons or dogs.Cevap
  2. B
    Chimpanzees acquired human-like serum proteins as a physiological response to similar environments during their lifespan.
  3. C
    Serological similarities between humans and chimpanzees represent analogous structures developed independently.
  4. D
    Differences in protein precipitation levels represent discontinuous variations within individual dog populations.

Cevap

Humans share a more recent common ancestor with chimpanzees than with baboons or dogs.
Immunological cross-reactivity measures the structural similarity of serum proteins. Since protein sequence is determined by genetic code, a higher percentage of precipitation demonstrates greater genetic similarity and a more recent common ancestor between humans and chimpanzees.

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1
Analyze the experimental method
Anti-human antibodies test the degree of structural similarity between human blood serum proteins and those of other animals through precipitation reactions.
Greater structural similarity between proteins leads to higher cross-reactivity and greater volume of precipitate.
2
Interpret the precipitation hierarchy
Chimpanzees exhibit the highest precipitation, followed by baboons, with dogs producing the least.
Protein structure is directly coded by DNA sequences; higher similarity in serum proteins demonstrates greater genetic similarity.
3
Formulate the evolutionary deduction
The highest biochemical similarity between humans and chimpanzees indicates they diverged from a common ancestor most recently.
Comparative biochemistry provides direct quantitative evidence of evolutionary relationships and divergence timelines.

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Comparative Serology as Evidence for Evolution
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Evidence for Evolution: Comparative Biochemistry and Biogeography

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