1. The recessive sh produces shrunken endosperm in corn kernels and its dominant
ID: 261610 • Letter: 1
Question
1. The recessive sh produces shrunken endosperm in corn kernels and its dominant allele sh+ produces plump kernels. The recessive gene c produces colorless endosperm and its dominant allele c+ produces colored endosperm. A testcross involving heterozygous plants having endosperm that is plump and colored produced the following offspring: 149 shrunken, colored; 4035 shrunken, colorless; 152 plump, colorless; 4032 plump, colored.
a. Determine the recombination frequency between the sh and c alleles. Express your frequency in map units
Explanation / Answer
Answer:
Hint: Recombinant progeny are always lesser than non-recombinant progeny in linkage.
Recombination frequency = (No. of recombinants / Total progeny)100
= (149+152/8368)100
= 3.6%
RF (%) = Distance between the genes (mu)
3.^ = 3.6 map units
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