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Biology Questions




Question;1.Cystic Fibrosis is also a;recessively inherited autosomal trait.;Given the following pedigree what are the chances of a child in;generation IV having cystic fibrosis?;2. Huntington?s is inherited through a;dominant mutation in a gene on chromosome 4.;This mutation causes brain cells in certain areas of the brain to be;destroyed. Jenny knows that the;defective (H) gene that causes Huntington?s disease is a dominant gene.;If a person has one defective (H) gene;that person will have Huntington?s disease. Jenny hopes that she got two normal;genes! Jenny?s father refuses to be tested to see if he has the dominant gene;that causes Huntington?s disease. She wonders if she should get the genetic;test. She also wonders if her brother (Jeremy) or other members of her family;should consider getting tested to see if they have the defective (H) gene.;So Jenny spoke with a genetic;counselor. The genetic counselor asked;questions about Jenny?s family and recorded the information to create a;pedigree chart. Jenny explains that none of her mother?s relatives have;Huntington?s disease. But, her grandmother (her father?s mother) and two of her;aunts (her father?s sisters) have Huntington?s disease but she also has an;uncle and an aunt who do not have the disease. Draw a pedigree chart that;represents Jenny?s father?s family to help you answer what is the probability;that Jenny or her brother will have Huntington?s disease?;3.Match the;probable/possible genotypes for each of the 15 individuals below, given that the;trait being followed is sex-linked color-blindness? Use C to indicate the non-color-blind version;of the gene and c to indicate the color-blind version of the gene.;Individual 1;Individual 2;Individual 3;Individual 4;Individual 5;Individual 6;Individual 7;Individual 8;Individuals 9 and 10;Individual 11;Individual 12;Individual 13;Individual 14;Individual 15;A.;Cc;B.;C-;C.;c-;D.;CC/Cc;E.;cc;F.;CC/cc;G.;Cc/cc;H.;CC/Cc/cc;I.;c-/Cc;4.In the pedigree below, if the female;II-3, is found to have O+ what are the possible phenotype(s) for II-4?;5.Based on the;pedigree in question 4 what are the;possible genotypes for I-2?;6. Given the;pedigree in question 4, what are the possible genotypes for the offspring in;generation IV?;Ai ++, Ai +-, ii++;and ii +-;Ai ++, AA ++ and ii;++;Ai-- and ii--;both A and B are;possible;Both A and C are;possible;Both B and C are;possible;7.the;pedigree above, use the ratios of the offspring in generation II make a;prediction about the genotype for I-2.;Make sure to explain how you made your prediction.


Paper#62894 | Written in 18-Jul-2015

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