Wild-type porcupines have pointy quills. Scientists have identified several true

Question

Wild-type porcupines have pointy quills. Scientists have identified several true-breeding strains of porcupine that lack quills porcupine results in all wild-type offspring. The results of crosses between some of the true-breeding cuddly strains are as follows them a "cuddly Crossing any cuddly mutant to a wild-type cud1 x cud2 all cuddly offispring cud2 x cud3-all pointy offspring Why did the offspring from the cross between cud2 x cud3 mutants show the wildtype phenotype? O codominance O incomplete penetrance O complementation nance Which two mutations affect the same gene? cud1 cud2 cud3 Continued below

Explanation / Answer

Cud 1 X cud 2 BB aa XBB aa = Baa All are cuddy

cud 2 X cud 3 BBaa X AAbb = AaBb All are wild type

1. Complementation        

2. cud 1 and cud2

3. cud 1 X cud 3
Pointy - 25%
cuddy - 75%

4. pointy offspring = AaBb
it gives 9:7

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