12) In dogs there is a hereditary deafness caused by a recessive gene.docx

12) In dogs there is a hereditary deafness caused by a recessive gene (d). A kennel owner has a male dog that can hear, so his owner knows that his genotype is either DD or Dd. If the dog's genotype is Dd, then the owner does not want to use him for breeding. This can be tested by test crossing with a deaf female dog (dd). Draw the Punnett Squares to illustrate the two possible crosses. Show the genotypic and phenotypic ratios of all the offspring. Draw another Punnett square to illustrate how two hearing dogs could have deaf puppies.
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1. 12) In dogs there is a hereditary deafness caused by a recessive gene (d). A kennel owner has a
male dog that can hear, so his owner knows that his genotype is either DD or Dd. If the dog's
genotype is Dd, then the owner does not want to use him for breeding. This can be tested by test
crossing with a deaf female dog (dd). Draw the Punnett Squares to illustrate the two possible
crosses. Show the genotypic and phenotypic ratios of all the offspring. Draw another Punnett
square to illustrate how two hearing dogs could have deaf puppies.