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rk_9879 rk_9879
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11 years ago
And an explanation/examples please! Thank You!
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#1
11 years ago
In this scenario, meiosis proceeds as normal just without crossing over and gametogenesis is unaffected by the lack of recombination events, so all gametes are the same as the parental types. THe best example is male Drosophila - no recombination occurs, but gametogenesis is perfectly normal. The generation of recombinants occurs only in females. This is yet another reason why Drosophila are loved by geneticists as it makes gene mapping much easier.
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#2
11 years ago
Gametes are in every organism (male and female) even WITHOUT crossing over.
When these sex gametes fuse together they go to a process of double round of cell division
called MEIOSIS I and II.

*Crossing-over occurs in Meoisis I and it is a process wherein the homologous chromosomes exchange parts of each their chromatids. Crossing- over just randomizes the biological information and ensures the uniqueness of each individual.
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