Recombination Freq.: Genetic Mapping Hwk Problem

[shawonna23]

Homework Statement

The recombination frequency between gene “Q” and gene “Z” is found to be 23.5%. The recombination frequency between “Q” and a third gene “R” is 10%. The frequency of recombination between “Z” and “R” is 13.5%. Which one of the following is NOT true concerning these three genes?
Choose one answer.
a. Gene “R” is closer to gene “Q” than gene “Z”.
b. Gene “Q” is in between gene “R” and gene “Z”.
c. Gene “R” is closer to gene “Q” than gene “Z”.
d. Crossing over is most likely to occur between gene “R” and gene “Z” than between
gene “R” and gene “Q”.

Homework Equations

Q-------------------------------------Z
Q----------R
R--------------------------Z

The Attempt at a Solution

B is not true but for D i thought that crossing over would most likely occur between R and Q than between R and Z?

 

[Ygggdrasil]

You are correct that B is not true. D is true because the recombination frequency between R and Z (13.5%) > the recombination frequency between R and Q (10%).

 

[shawonna23]

Thanks for the explanation!