Lecture 9 Flashcards
(7 cards)
1
Q
What causes genetic diversity?
A
Independent assortment and homologous recombinant during meiosis
2
Q
When does recombination occur?
A
Metaphase I
Non-sister chromatids cross over at the chiasmata and exchange information (typically 1-3 chiasmata form between non sister chromatids)
3
Q
What is genetic linkage?
A
When two genes are inherited together
4
Q
What is the formula for recombination frequency?
A
The total number of recombinants divided by the total progeny (as a percentage)
5
Q
What is a centimorgan?
A
The length of DNA where recombination has occurred every 100 attempts
6
Q
What is the trihybrid test?
A
Crosses use 3 genes for 3 different characteristics to tell us their linear order
Phenotypes with the least number of progeny represent double recombinants
7
Q
A
