In the cat, two gene loci on an autosomal chromosome are 26 map units from each

Question

In the cat, two gene loci on an autosomal chromosome are 26 map units from each other. At locus 1, the E allele for big ears is completely dominant to the e allele for small ears. At locus 2, the G allele for grey hair is completely dominant to allele g for white hair.

         A strain of cat, true-breeding for big ears and white hair, is mated to strain 2, true-breeding for small ears and grey hair and produce many F1-generation cats. The F1-generation cats mate with each other.  

______: If that mating among F1-generation cats produced only 1 kitten, what is the probability that the kitten has small ears and white hair? Show your calculation.

Explanation / Answer

True-breeding for big ears and white hair (EEgg) x true-breeding for small ears and grey hair (eeGG)

F1 offspring : All big ears and grey hair

EeGg x EeGg

F2 offspring: 3:1 ratio of big ears, grey hair and small ears, white hair

EEGG : big ears and grey hair

EeGg : big ears and grey hair

EeGg : big ears and white hair

eegg : small ears and white hair

If the mating among F1-generation cats produced only 1 kitten, the probability that the kitten has small ears and white hair is 1/4 or 25%.

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