Neco Model Questions Vol1 2020 Biology Question 25
Practice objective / multiple choice question 25 from the 2020 Neco Model Questions Vol1 Biology examination.
In Drosophila, two genes A and B are located on the same chromosome with a recombination frequency of \(12\%\). The dominant alleles are \(A\) and \(B\); recessive alleles are \(a\) and \(b\). A homozygous dominant individual (genotype \(AA\ BB\)) is crossed with a homozygous recessive individual (\(aa\ bb\)). The F\(_1\) generation is test‑crossed with a homozygous recessive (\(aa\ bb\)). (a) What is the map distance between genes A and B in centimorgans? (b) Out of 500 progeny from the test cross, how many are expected to show recombinant phenotypes? Provide the number of recombinant offspring.
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This is Neco Model Questions Vol1 2020 Biology Question 25. It is one of the objective questions from the 2020 Neco Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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