John and Yoko, a couple with attached earlobes, had a child. The newborn is brought to Yoko, and she suspects immediately the child is not theirs. What are the genotypes of the parents? Why would the parents suspect immediately the child is not theirs?

Question

anonymous · Answer

so they will have a mix phenotype of recessive and donimant so example using  
A =attached 
a = not attached  
both parents have the dominant gene so  Aa and Aa combine it the chance of having not attached earlobes it 25% so a different expression by the gene

anonymous · Answer

Thank you! This example definitely helps.