Midterm II - BIOL 340 MIDTERM II November 24, 2009 = 175...

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

View Full Document Right Arrow Icon
BIOL 340 – MIDTERM II November 24, 2009 = 175 points Page 1 of 4 Write only answers on lines provided. Anything else on lines will result in deducted points . PRINT YOUR NAME: KEY 1. In Drosophila , tan body ( t ), round eyes ( r ), and missing wing veins ( m ) are all recessive, autosomal traits. In the parental generation you cross a true-breeding female to a true-breeding male to produce the F 1 generation. You testcross an F 1 female and obtain the following 1,000 individuals in the testcross offspring: 4 = wild-type 4 = tan, round, missing 408 = tan 406 = round, missing 26 = round 28 = tan, missing 64 = missing 60 = tan, round a. Construct a complete map showing mutant gene order and distances in each region for adjacent pairs of genes. ( Worth 15 points; 5 points for the correct gene in middle; 5 points each for the correct distances ) r-------13.2---------t--------6.2------m b. What is the value for the coefficient of coincidence? 1 c. How much interference is there? 0 d. What does the interference value in this problem specifically mean? THERE IS NO INTERFERENCE; CROSSING OVER IN ONE REGION HAS NO EFFECT ON CROSSING OVER IN ADJACENT REGION. e. Give the genotype of the F 1 female using proper Drosophila notation and showing proper linkage relationships. r + t m + // r t + m f. If you testcross an F 1 male Drosophila instead of an F 1 female, what phenotypes with corresponding ratios will appear in the testcross offspring? ½ TAN: ½ ROUND, MISSING 2. In the F 2 of guinea pigs, you observe for coat color a phenotypic ratio of 9 black to 6 brown to 1 albino. You then testcross the F 1 that produced this F 2 phenotypic ratio and obtain 1,000 guinea pigs. a.
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 03/06/2011 for the course BIOL 340 taught by Professor Margaretjefferson during the Fall '09 term at California State University Los Angeles .

Page1 / 4

Midterm II - BIOL 340 MIDTERM II November 24, 2009 = 175...

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