BIS101-Mid1 - 09

BIS101-Mid1 - 09 - Chan Midterm 1 Answer Key Winter 2009...

Info icon This preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Chan Midterm 1 Answer Key, Winter 2009 1. (11pts) You have identified 6 Drosophila mutants that are defective for flying; you designate your mutants fly1-fly6. You decide to perform complementation tests. You complete the complementation tests for fly1, fly2 and fly3 and obtain the following results: Fly1 fly2 fly3 fly4 fly5 fly6 fly1 - + + + + - fly2 + - - + - + fly3 + - - + - + fly4 + + + - + + fly5 + - - + - + fly6 - + + + + - a) Predict the outcome of complementation test with fly4, fly5 and fly6 by filling in completely the table above (3pts). b) How many different complementation groups are represented by fly1-fly6? Three complementation groups c) Which mutants fall into the same complementation group? - fly1,6 - fly2,3,5 - fly4 D) You are particularly interested in fly4. Interestingly you find that when the flies are grown at 15 0 C they can fly but at 20 0 C they can not fly. What type of allele is fly4? 1 word please. (2pts) Conditional (or temperature sensitive)
Image of page 1

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

View Full Document Right Arrow Icon
2. (16pts) In mice, a recessive mutation in gene T results in tail-less animals and a second unlinked recessive mutation in gene F results in fat animals. Indicate the genotypes of the parents of the following crosses, a-d, in the space below. Phenotype of Progeny : Phenotype of Parents Tail Tail tail less tail less Slim fat Slim fat (a) Tail, Slim x tail-less, fat 24 0 25 0 (b) Tail, Slim x tail-less, Slim 30 10 29 11 (c) Tail, Slim x Tail, fat 15 14 4 5 (d) Tail, fat x tail-less, Slim 8 9 9 9 a) (4pts) TtFF x ttff b) (4pts) TtFf x ttFf c) (4pts) TtFf x Ttff d) (4pts) Ttff x ttFf
Image of page 2
3. (10pts) In birds, assume blue feather color is dominant to yellow feather color and all animals are true breeding. A yellow-feathered male is crossed to a blue-feathered female. and the all of the male offspring have blue feathers while all of the female offspring have yellow feathers. However, when the reciprocal cross is performed, blue-feathered male crossed to a yellow feathered female all of the offspring is blue. Please explain this result and indicate the genotypes of the parents and offspring from these crosses. (Hint: females are the heterogametic sex and have ZW sex chromosomes and males are the homogametic sex in birds with ZZ chromosomes).
Image of page 3

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

View Full Document Right Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern