11) In humans, brown eyes (B) is dominant over blue (b). A brown-eyed man marries a blue-eyed women and they have three children, two of whom are brown-eyed and one of whom is blue-eyed. Draw the Punnett Square that illustrates this marriage. What is the man's genotype? What are the genotypes of the children? 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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11) In humans- brown eyes (B) is dominant over blue (b)- A brown-eyed.docx
1. 11) In humans, brown eyes (B) is dominant over blue (b). A brown-eyed man marries a blue-
eyed women and they have three children, two of whom are brown-eyed and one of whom is
blue-eyed. Draw the Punnett Square that illustrates this marriage. What is the man's genotype?
What are the genotypes of the children? 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.
