In a wild flower, the recessive genes \'gl\' (glossy leaves) and \'th\' (thorns)

Question

In a wild flower, the recessive genes 'gl' (glossy leaves) and 'th' (thorns) are both located on chromosome 7 and are 4.5 m.u apart. A pure breeding plant with glossy leaves is mated with a pure breeding plant with thorns and the progen are self-fertilized. Approximately what percentage of the progeny would you expect to have both glossy leaves and thorns? 0.2025% 22.8% 0.051% d. 2.25% 47.75% A triple heterozygous individual for the mutant genes a', b. and c was test crossed. What is the probable gene arrangement given the following data for their progeny? a++ 1014 +b+ 10 ++c 1011 ab+ 1012 a+c 10 +bc 1009 abc 12 +++ a all genes unlinked all three linked 'd' in the middle all three linked 'c' in the middle 'a' and 'b' linked, 'c' unlinked 'a' and 'c' linked, 'b' unlinked

Explanation / Answer

The recombination frequency is directly proportional to distance between genes. Here, the two genes are 4.5 mu apart which means that the recombination frequency is 45%. To obtain both glossy leaves and thorns in the same plants of F2 progeny, there should be recombination between the said genes as the parent generation is pure breeding for single trait. So, approximately, 47.75% of F2 progeny would have both characters in same plants. Option E is the correct answer.

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