Umiejętności z tego działu sprawdza 41 zadań wzorowanych na arkuszach IB z lat 2022–2026. Dział pojawia się w 32 z 54 arkuszy w bazie.
Sexual life cycles can produce new combinations of inherited traits. (a) Draw and label a section of an insect-pollinated flower, indicating the structures associated with male and female gamete production. (b) Explain the sources of variation arising through…
Two insect populations become reproductively isolated because they mate on different host plants within the same woodland. Which feature makes this an example of sympatric rather than allopatric speciation? A. Their descendants will necessarily have identical…
The limb plans below retain corresponding bones despite their different uses. Which kind of evidence for common ancestry do they illustrate? A. Analogy produced only by the same habitat B. Unrelated structures that happen to perform identical functions C.…
The streamlined bodies of a shark and a dolphin evolved in separate vertebrate lineages. Which interpretation is correct? A. A similar aquatic demand has favoured convergent evolution of an analogous overall form B. The dolphin descended directly from the…
A new river channel separates a rodent population. Over many generations, the isolated populations diverge. Which explanation fits? A. Sympatric speciation because the populations remain separated by water B. Allopatric divergence with different selective…
Deduce whether these data establish that Pan paniscus is more closely related to Gorilla gorilla than either is to humans.
State the mode of speciation illustrated.
Describe how the two species could have arisen from the ancestral population.
A flowering plant can reproduce sexually or form new individuals by vegetative growth. (a) Explain why both meiosis and gamete fusion are needed in a sexual life cycle. (b) Describe how interphase and mitosis preserve chromosome number during vegetative…
Biologists use inherited similarities and differences to investigate population change and relationships. (a) Describe how homologous structures provide evidence for evolution. (b) Outline the assumptions and use of Hardy–Weinberg calculations in a population…
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