Distinguish incomplete dominance from codominance using flower colour and AB blood-group examples.
Tę umiejętność sprawdza 5 zadań wzorowanych na arkuszach IB z lat 2024–2026.
In a plant species, flower pigment shows incomplete dominance. A true-breeding dark-magenta plant is crossed with a true-breeding white plant. What flower phenotype is expected in the first generation? A. All flowers have an intermediate pale-magenta colour B.…
At a locus showing incomplete dominance in snapdragons, homozygous crimson and ivory plants produce only pale-rose heterozygotes. What phenotypic proportions are expected when two of these heterozygotes are crossed? A. Half crimson and half ivory, with no…
In a snapdragon line showing incomplete dominance, crimson homozygotes and ivory homozygotes produce pale-rose heterozygotes. A pale-rose plant is crossed with an ivory plant. Which result is expected? A. Only crimson offspring B. Crimson and ivory offspring…
In a snapdragon cross, homozygous deep-red plants and homozygous white plants produce pink heterozygous offspring. Which explanation fits this observation? A. Complete dominance, because the offspring resemble one homozygote B. Incomplete dominance, because…
In a model inherited condition, NN individuals have no symptoms, NM individuals have a mild phenotype and MM individuals have a severe phenotype. Two NM parents already have one NN child and one NM child. What is the probability that their next child will have…
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