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Lab 8 Practice Genetic Problems Complete the following problems on your own as practice for the quiz and for the exam The answer key is available online 1 Pigmented skin is dominant over non pigmented albino skin Curly hair is incompletely dominant over non curly hair A person who is heterozygous for curly hair wavy and pigmented skin and a person who has pigmented skin genetically homozygous for this trait but has straight hair decide to have a child a What is the chance of their having a curly haired child with pigmented skin b What is the chance of their having a straight haired child with non pigmented skin c What is the chance of their having a straight haired child with pigmented skin 2 Ability to curl your tongue is a dominant trait If two persons who were heterozygous for this trait had a child what is the probability that the child would also be heterozygous for the trait 3 Hemophilia is a sex linked disease Homozygous recessive genes are needed on the X chromosomes for the disease to be expressed A man who does not have this disease and a woman who is a carrier heterozygous for the disease decide to have children a What are the genotypes of this man and woman b What is the possible genotype of a son c What is the possible genotype of a daughter d What is the probability of a son having hemophilia e What is the probability of a daughter having hemophilia 4 Marfan s syndrome is a genetic trait inherited in a dominant mode The trait causes a weakening of the aorta that can be fatal unless surgically corrected A teenager whose mother was affected with the disease but whose father was unaffected is concerned that she may have the trait a What is the phenotype of each of her parents Genotypes b What is the chance that the teenager has Marfan s syndrome 5 In some dogs barking while chasing rabbits is due to a dominant gene others do not bark Dogs with erect ears are dominant to dogs with drooping ears By crossing a heterozygous erecteared barker with a droop



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