Linkage And Recombination Flashcards
What is the effect of X-linked genes on reciprocal crosses
Reciprocal crosses give different results
What increases the likeliness of alleles on the same chromosome being separated
The further apart they are on the chromosome
What is recombination frequency
How likely it is for crossing over to occur
How do you work out the recombination frequency
RF = recombinants/total offspring x 100
What does the ratio 1:1:1:1 represent
No linkage
What is incomplete linkage
Homologous chromosomes break at same points and exchange parts
Parental types much more frequent than recombinants
What would show there was complete linkage
Two phenotypes and approximately equal numbers
What is coupling
Double heterozygous individual with two dominant alleles on same chromosome and recessives on another (AB/ab)
What is repulsion
Dominant and recessive alleles on same chromosome (Ab/aB)
