# In plants, you want to know whether two loci, P and Q, are linked and if...

In plants, you want to know whether two loci, P and Q, are linked and if so, what their map distance is. You do a testcross with a P/p●Q/q plant and observe the following progeny. Based on this information, what are the genotypes of the parents? Genotype Progeny P/p●Q/q 21 p/p●q/q 25 P/p●q/q 216 p/p●Q/q 238

a) The loci are linked and 4.0 m.u. apart

b) the loci are linked and 18.4 m.u. apart

c) the loci are linkd and 9.2 m.u. apart

e) the loci are linked and 8 m.u. apart

Please show how you arrive to the answer including the m.u. number

c) the loci are linkd and 9.2 m.u. apart

Explanation:

Hint: Non-recombinant progeny are more common in linkage.

Recombinant progeny are very less number. Recombinant progeny are p/p.q/q & P/p.Q/q

Recombination frequency (RF)= (no. of recombinant progeny / total progeny)100

Total progeny =

RF= (46 /500)100 = 9.2%

RF(%) = Distance between genes (mu)

Distance between gene P & Q = 9.2 m.u.

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