UMass Amherst BIOLOGY 283 - Homework_2 (9 pages)

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Homework_2



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Homework_2

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Pages:
9
School:
University of Massachusetts Amherst
Course:
Biology 283 - General Genetics
General Genetics Documents

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NAME Homework 2 Biol 283 General Genetics Fall 2014 1 5 points Mendel crossed pea plants producing round seeds with those producing wrinkled seeds From a total of 7 324 F2 seeds 5 464 were round and 1 860 were wrinkled Using the symbols R and r for the alleles a Using symbols write the original P1 cross and the F1 cross that is used to produce an F2 b Write the genotype s of the F1 progeny using symbols c Write the gametes produced by the F1 generation using symbols d Summarize the expected F2 phenotypes and their frequencies e Summarize the expected F2 genotypes and their frequencies 1 NAME 2 4 points How many genetically different gametes could be formed by an individual with the following genotypes Show your work for partial credit a Ff gg hh Ii b Ff Gg Hh Ii 3 6 points In the cross Ff gg hh Ii X Ff Gg Hh Ii what is the probability of obtaining the following offspring Show your work for partial credit a phenotypically FGHI all dominant b genotypically ff gg hh ii c genotypically Ff gg hh II 2 NAME 4 5 points In Drosphilia melanogaster fruit flies the gene ey causes the fly to be eyeless and is recessive to the wild type WT allele ey The b gene which is recessive to the WT allele b causes the flies to have black bodies WT fruit flies are brown For the following crosses calculate the probability that an offspring will be phenotypically identical to one of its parents Please be clear state the phenotypes of the parents and show your calculations a 1 point ey ey b b X ey ey b b b 2 points ey ey b b X ey ey b b c 2 points ey ey b b X ey ey b b 3 NAME Pedigree for questions 5 6 5 5 points If the trait in the pedigree is autosomal DOMINANT a State which if any individual s in the pedigree have UNKNOWN genotypes b State which if any individual s in the pedigree are HOMOZYGOUS c State which if any individual s in the pedigree are HETEROZYGOUS d what is the probability that future children of II 3 and II 4 will be affected e what is the probability that future children of



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