Principle of Inheritance and VariationEasyBloom L3
Question
Which of the following statements is not true of two genes that show 50% recombination frequency ?
Options
A.If the genes are present on the same chromosome, they undergo more than one crossovers in every meiosis
B.The genes may be on different chromosomes
C.The genes are tightly linked
D.The genes show independent assortment
Solution
(a) [Key Concept: Recombination Frequency — 50% Interpretation] At 50% recombination frequency, statement (a) — 'genes are tightly linked' — is NOT TRUE. 50% recombination is the MAXIMUM observable recombination frequency and indicates genes assort INDEPENDENTLY (like unlinked genes). Tightly linked genes show VERY LOW recombination (<10%). At 50% recombination: (b) genes behave as if independently assorting — TRUE; (c) if on same chromosome, multiple crossovers occur making them appear unlinked — TRUE; (d) they may indeed be on different chromosomes — TRUE. Only (a) is false.
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