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In guinea pigs, the allele for rough coat (R) is dominant over the allele for smooth coat (r). A heterozygous guinea pig (Rr) and a homozygous recessive guinea pig (rr) have nine offspring. When drawing a Punnett square for this cross it shows that 50% of the offspring can have rough coats and 50% can have smooth coats. Knowing this, how is it possible for all of the offspring (100%) to have smooth coats?
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