Neco 2020 Biology Question 27
Practice objective / multiple choice question 27 from the 2020 Neco Biology examination.
A plant is heterozygous for two linked genes, A/a and B/b, in the cis configuration (AB/ab). In a test cross with a double‑recessive plant (ab/ab) the following offspring numbers were recorded: 380 with both dominant traits, 380 with both recessive traits, 60 with only the dominant A trait, and 60 with only the dominant B trait. (i) Determine the recombination frequency between the two genes. (ii) If the heterozygous plant is crossed with a double‑recessive plant, what percentage of the progeny are expected to show both dominant phenotypes?
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About This Question
This is Neco 2020 Biology Question 27. It is one of the objective questions from the 2020 Neco Biology examination.
Difficulty level: Medium .
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