× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
g
1
New Topic  
rocketleague rocketleague
wrote...
Posts: 686
Rep: 0 0
7 years ago
A cross is made between yeast cells with different alleles for a set of linked genes: pr+q  p+rq+. The resulting tetrads show a 3:1 ratio for r+ to r instead of the expected 2:2 ratio. Can you explain how this could have occurred?
 
  What will be an ideal response?
Read 115 times
1 Reply

Related Topics

Replies
wrote...
7 years ago
Gene conversion by a mismatch repair mechanism could have caused this deviation from expected ratios. During pairing of homologous chromosomes in meiosis, recombination between the two inner chromatids occurred, resulting in heteroduplex (mismatched) DNA strands. Both mismatches were repaired by excision and DNA synthesis to match the parent DNA with the r+ allele.
New Topic      
Explore
Post your homework questions and get free online help from our incredible volunteers
  1327 People Browsing
Related Images
  
 219
  
 506
  
 249
Your Opinion
Which country would you like to visit for its food?
Votes: 895