You have isolated two recessive mutations that affect coat color in guinea pigs.

Question

You have isolated two recessive mutations that affect coat color in guinea pigs. The first mutation makes purple guinea pigs and the second one makes green guinea pigs. Guinea pigs are normally brown. You have crossed green and purple Guinea pigs: Give the expected F1 and F2 ratios for the following scenarios:

a. Purple and green are alleles of the same gene and part of a phenotypic series (purple is dominant relative to green).

b. Purple and green are alleles of the same gene and no dominance is observed among them.

c. Purple and green are alleles of different genes and they represent a simple interaction.

d. Purple is epistatic to green.

e. The purple and green mutations complement and are synthetically lethal

Explanation / Answer

a) Purple and green are alleles of the same gene and part of a phenotypic series (purple is dominant relative to green).

BY the above table this results purple domiant the green.

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