Explain how hybridization and polyploidy can establish reproductive isolation in a small number of generations.
Tę umiejętność sprawdza 9 zadań wzorowanych na arkuszach IB z lat 2022–2025.
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…
A museum exhibit explores biological diversity from genetic sequences to infectious particles. (a) Explain how nucleic acids can encode a wide variety of base sequences. (b) Describe structural diversity among viruses, using named examples. (c) Suggest…
A chromosome-doubled population of a flowering plant arises beside its diploid relatives. Which observation provides the strongest evidence of a new species? A. The doubled plants grow taller only when fertilizer is added B. One doubled plant reproduces by…
Which event can create a reproductive barrier in a plant lineage within very few generations? A. Reshuffling existing alleles by independent assortment without altering chromosome number B. Inheritance of a continuously variable trait through many…
(a) Outline how new heritable traits can arise and become more common in a population over time. (b) Explain how polyploidy can cause the abrupt origin of a new plant species. (c) Suggest advantages of scientific species names.
(a) Outline how new heritable traits can arise and become more common in a population over time. (b) Explain how polyploidy can cause the abrupt origin of a new plant species. (c) Suggest advantages of scientific species names.
Enzymes, replication and evolutionary processes affect biological systems. (a) Outline, using graphs, effects of factors that influence enzyme activity. (b) Describe the functions of three named enzymes in DNA replication. (c) Explain speciation, including…
A plant normally has two complete chromosome sets. A new individual has four complete sets in each somatic cell. Which term describes this change? A. A single-base substitution B. Monosomy C. Polyploidy D. Loss of a nucleolus
Evolutionary relationships can be investigated using populations, chromosomes and molecular evidence. (a) Outline how adaptive radiation provides evidence for evolution. (b) Describe polyploidy and its possible role in speciation. (c) Explain how a newly…
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