Question

In a wild flower, the recessive genes ‘gl’ (glossy leaves) and ‘th’ (thorns) are both located on chromosome 7 and are 5.5m.u apart. A pure breeding plant with glossy leaves is mated with a pure breeding plant with thorns and the progeny are self-fertilized. Approximately what percentage of the progeny would you expect to have both glossy leaves and thorns?

a. 47.25%

b. 0.2025%

c. 2.75%

d. 0.076%

e. 22.3%

explain please.

Answer 1

5.5 mu gelget 5.5 mu talent gege that tht x getge+th the get ge thith (no glasy, no thorry) ganeles :- Parental =9405440 gl tht = 47.25% get th = 47.25/ kecombinant = 5.5% glth = 2-754 getthys 4-75-8 Required progany - Resmied progany = glossyt thorny gege th the = geth x geth = d-75.7 x 2.75% 2.75 = 0.00078625 ole = 0.00075625 X 100

Number of recombinant gametes = gene between the genes

Number of parental gametes = 100 - number of recombinant gametes

Proprotion of a progeny = multiply the proportion of the gametes involved

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