meiosis and genetic diversity Flashcards
(11 cards)
Which processes in meiosis produced cells which are genetically different?
Independent segregation, genetic recombination by crossing over
Why does independent segregation result in variation?
The pairing and separation of a pair of chromosomes is independent to the separation of another pair
What will gametes possess due to independent segregation?
One member from each original homologous pair
What is used to calculate the possible number of varied combinations?
2 n
What does n represent?
The number of homologous pairs
When does crossing over happen?
During prophase of the first meiotic division
What is a bivalent?
When two members of each homologous pair lie side by side
What happens in crossing over?
The chromatids of the homologous chromosomes intertwine
What also results in crossing over?
The chromatids break and equal portions of the chromatids are exchanged
What is the place where crossing over occurs called?
Chiasma
What is this process known as?
Genetic recombination
