× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
5
g
1
Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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 117 times
1 Reply

Related Topics

Replies
wrote...
#1
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      
Quick Reply
Bold
Italic
Underline
Strikethrough
Subscript
Superscript
Insert Math Equation
Font Name
Font Color
Align left
Center
Align right
Bullet list
Numbered list
Insert a horizontal rule
Insert a table
Insert a Quote
View source
Explore
Post your homework questions and get free online help from our incredible volunteers
  487 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Show Emoticons
:):(;):P:D:|:O:?:nerd:8o:glasses::-):-(:-*O:-D>:-D:o):idea::important::help::error::warning::favorite:
Related Images
  
 425
  
 452
  
 1946
Your Opinion
Which is the best fuel for late night cramming?
Votes: 512
Previous poll results: Which country would you like to visit for its food?