A gene region where there are two distinct alleles present. One normal allele, one mutated allele, or two distinct mutated alleles can make up a heterozygous genotype.
Let's say that the letter S stands for a solid coat and the letter s for a spotted coat. This indicates that the genomes of the two heterozygous cocker spaniels are Ss. As a result, the likelihood of the progeny having a solid coat (SS and Ss) is 75% and a spotted coat (SS) is 25%.
There is a 25% chance that the firstborn puppy in the first litter will have spotted fur. The likelihood that 4 of the 5 remaining pups will have spotted fur is 1/4 x 1/4 x 1/4, or 1/256. Calculate the likelihood that the second litter will have 6 pups with solid fur by multiplying 3/4 by 6, which equals 64/4096 or 1.5% The probability that the second litter will contain 1 pup with spotty fur is 25%.
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