Genetics as it applies to evolution, molecular biology, and medical aspects.

Moderators: honeev, Leonid, amiradm, BioTeam

Post Reply
Posts: 11
Joined: Mon Apr 25, 2005 10:10 pm


Post by taata » Thu Jul 07, 2005 11:56 pm

The wild type (normal) fruit fly, Drosophila melanogaster, has straight wings and long bristles. Mutants have been isolated that have curled wings or short bristles. Consider the five crosses given in the table below.

Cross Number of progeny
Straight wings, long bristles Straight wings, short bristles Curled wings, long bristles Curled wings, short bristles
1 Straight, short X straight, short 30 90 10 30
2. Straight, long X straight, long 120 0 40 0
3 Curled, long X straight, short 40 40 40 40
4 Straight, short X straight, short 40 120 0 0
5 Curled, short X straight, short 20 60 20 60

a) For each mutation (curled wings, short bristles), determine whether the mutant allele is dominant or recessive. State which crosses support your answer.
b) Devise a notation system (symbols) to represent the different alleles for each character.
c) Determine the genotypes of each of the parents in each cross. :cry: :cry: :cry:

User avatar
Inland Taipan
Inland Taipan
Posts: 5345
Joined: Thu Jan 20, 2005 8:14 pm
Location: Nashville, TN

Post by mith » Fri Jul 08, 2005 1:33 am

I'll give you a hint for b....there's really no wrong answer as long as it's composed of letters with the dominant being designated by capital letters.
Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;

Post Reply

Who is online

Users browsing this forum: No registered users and 5 guests