When does Crossing over occur?

[bluesdeluxe]

I've read several places that say it occurs only in tetra formation during Meiosis Prophase I. Other places suggest it happens in Meiosis Metaphase. I originally thought metaphase. Any definite answer here?

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[allstardentist]

i think its prophase I

 

[Clapton]

In leptonema of early prophaseI of meiosis.

 

[bluesdeluxe]

thanks

 

[midwestboy]

leptotene stage of prophase I in meiosis

 

[flylab101]

leptotene stage of prophase I in meiosis

What's leptotene stage? are there any other substage like that for the other main stages?

 

[fancymylotus]

What's leptotene stage? are there any other substage like that for the other main stages?

leptotene zygotene pachytene diplotene diakinesis (in prophase I)

 

[aggie-master]

I had this question on the real DAT.

The answer was Meiosis Prophase I.

 

[Banana Berry]

I had this question on real DAT,too..

 

[blankguy]

Prophase I
Sorry can help in joining the answer chorus

 

[djeffreyt]

leptotene zygotene pachytene diplotene diakinesis (in prophase I)

I wouldn't worry about these substages...the DAt won't test on them unless they suddenly decided last week to make the test 10000% harder.

Just remember that Crossing Over occurs in Prophase I of meiosis, and you be fine...just watch out for the trick answer:

c) on late night TV with John Edwards

this is a trick aswer...do not fall for it.