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biology meiosis

hey can anyone help with the idea of crossing over?
I don't understand the difference between the term chiasmata and bivalents.
would it be correct to say bivalents form and chiasmata exchange dna??
pls could someone put it into a sentence
Original post by user493
hey can anyone help with the idea of crossing over?
I don't understand the difference between the term chiasmata and bivalents.
would it be correct to say bivalents form and chiasmata exchange dna??
pls could someone put it into a sentence

A bivalent is the joining of two pairs of homologous chromosomes at a centromere in meiosis I. Once a bivalent is formed, crossing over occurs at chiasmata (chiasmata or chiasma for the singular are the sites of crossover). Crossing over occurs between non-sister chromatids of homologous chromosomes. The crossing over of alleles between these chromatids contributes towards increasing genetic variation. Hopefully this makes sense :smile:
Reply 2
thankuuu
Original post by DanielK1456
A bivalent is the joining of two pairs of homologous chromosomes at a centromere in meiosis I. Once a bivalent is formed, crossing over occurs at chiasmata (chiasmata or chiasma for the singular are the sites of crossover). Crossing over occurs between non-sister chromatids of homologous chromosomes. The crossing over of alleles between these chromatids contributes towards increasing genetic variation. Hopefully this makes sense :smile:
Original post by user493
hey can anyone help with the idea of crossing over?
I don't understand the difference between the term chiasmata and bivalents.
would it be correct to say bivalents form and chiasmata exchange dna??
pls could someone put it into a sentence

Heya!
If it helps, Study Mind has free revision notes on the topic that you will find helpful :h:

I hope this helps!
MIlena
UCL PFE
Study Mind
Reply 4
thank you!
Original post by StudyMind
Heya!
If it helps, Study Mind has free revision notes on the topic that you will find helpful :h:

I hope this helps!
MIlena
UCL PFE
Study Mind
(edited 1 year ago)

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