On Sesame Steet, behavior is genetically controlled. Individuals homozygous for

Question

On Sesame Steet, behavior is genetically controlled. Individuals homozygous for the dominant allele 'Hobo' value their freedom and live in garbage cans. Thirty percent of them die of exposure. Individuals homozygous for the recessive alllele 'homebody' rarely leave the house. Fifty percent of them eventually succumb to diseases associated with sedentary lifestyle and cookie binges. Heterozygous individuals achieve a combinantion of comfort and fresh air that allows them to outlive everyone else.
A) If the initial frequency of the 'Hobo' gene is 0.8, what will p and q be after one generation of selection?
B) What are the equilibrium frequencies of 'Hobo' and 'homebody'?

Explanation / Answer

Dominant and recessive traits Using genetic principles, the information presented in a pedigree can be analyzed to determine whether a given physical trait is inherited or not and what the pattern of inheritance is. In simple terms, traits can be either dominant or recessive. A dominant trait is passed on to a son or daughter from only one parent. Characteristics of a dominant pedigree are: 1) Every affected individual has at least one affected parent; 2) Affected individuals who mate with unaffected individuals have a 50% chance of transmitting the trait to each child; and 3) Two affected individuals may have unaffected children. Recessive traits are passed on to children from both parents, although the parents may seem perfectly "normal." Characteristics of recessive pedigrees are: 1) An individual who is affected may have parents who are not affected; 2) All the children of two affected individuals are affected; and 3) In pedigrees involving rare traits, the unaffected parents of an affected individual may be related to each other. If you view the web site below it will be helpful. http://www.hhhttp://www.hhmi.org/biointeractive/vlabs/cardiology/content/dtg/pedigree/ped2.gif

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