in dogs, there is a hereditary deafness caused by a recessive gene, "d." a kennel owner has a male dog that she wants to use for breeding purposes if possible. the dog can hear, so the owner knows his genotype is either dd or dd. if the dog's genotype is dd, the owner does not wish to use him for breeding so that the deafness gene will not be passed on. this can be tested by breeding the dog to a deaf female (dd). draw the punnett squares to illustrate these two possible crosses. in each case, what percentage/how many of the offspring would be expected to be hearing?