Neco Model Questions Vol1 2025 Biology Question 32
Practice objective / multiple choice question 32 from the 2025 Neco Model Questions Vol1 Biology examination.
In pea plants the genes for plant height (A = tall, a = dwarf) and pod colour (B = green, b = yellow) are linked and are 10 map units apart. A plant heterozygous in coupling phase (A B / a b) is test‑crossed with a recessive plant (a b / a b). Among 2000 progeny the observed phenotypes are: tall‑green 800, tall‑yellow 200, dwarf‑green 200, dwarf‑yellow 800. (a) Calculate the recombination frequency, (b) give the expected numbers of each phenotype if the two genes assorted independently, and (c) using a chi‑square test at the 5 % level, decide whether the genes are linked.
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This is Neco Model Questions Vol1 2025 Biology Question 32. It is one of the objective questions from the 2025 Neco Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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