2008problemset5key - ProblemSet#5KEY BICD100W08(L.Smith)

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Problem Set #5 KEY BICD 100 W’ 08 (L. Smith) 1.) In Drosophila , a recessive mutation ca causes eyes to be claret in color when homozygous, and a recessive mutation ro causes the eye to have a rough surface when homozygous. Another recessive mutation, e, causes body color to be ebony when homozygous. A fly from a truebreeding claret eye line is crossed to one from a true-breeding rough eye, ebony body line. F 1 progeny are crossed to claret eye, rough eye, ebony body testers to generate the following F 2 progeny: wild type 49 ebony body 1 claret eye 395 rough eye 119 ebony body, rough eye 370 ebony body, claret eye 89 ebony body, rough eye, claret eye 66 From this data determine the linkage relationships between these 3 genes. Draw a map showing the gene order and the distances between genes in cM. (To answer these questions you will first have to consider why there are only 7 progeny classes. If you’d like to try a more straightforward 3 point cross problem to start with, try one from the book: #20 on pg. 162). One class of double recombinants has an ebony body. The other class of double recombinants would have rough, claret eyes, but as it happens there are none (not too surprising since there is only 1 ebony body fly – there must be a lot of interference here suppressing double recombination events). E--------19 cM -------Ro----11 cM----Ca 2.) A geneticist wanting to identify genes required for biosynthesis of arginine in Saccharomyces cerevisiae (baker’s yeast) isolates two arg - mutants that arose independently from one another. To
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/14/2008 for the course BICD 100 taught by Professor Nehring during the Winter '08 term at UCSD.

Page1 / 4

2008problemset5key - ProblemSet#5KEY BICD100W08(L.Smith)

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online