0
$\begingroup$

A chromosome has two chromatids. In meiosis weather both chromatid participate in crossing over or just only 1 chromatid does? enter image description here

So, I am asking whether 1 turquoise and 1 purple chromatid participate in crossing over or both chromatid of turquoise and purple chromatid participate on 1 to 1 basis?

$\endgroup$

2 Answers 2

2
$\begingroup$

The diagram you provide is just a schematic, showing a simple version to clarify what is happening in a crossover. It seems that at least once crossover has to occur in each bivalent for normal chromosome segregation to take place. This is called obligate crossover. Multiple crossovers do take place, but in eukaryotes this is usually limited to be four crossovers or less for each chromosome pair.

$\endgroup$
1
$\begingroup$

I think like that , different alleles coding for different traits are present on different positions on two chromatids So both can participate in the recombination only when chromatids of torquoise and purple have contrasting characters present on each chromatid Conclusion :- both chromatids of a chromosome will participate in recombination but at different time

$\endgroup$
2
  • $\begingroup$ Different time means in different cell cycle? So in same cell cycle can both chromatid recombine? $\endgroup$
    – Amit Kumar
    Oct 30, 2023 at 16:10
  • $\begingroup$ Different time means in one cycle as there are no only one trait to recombine in one cycle , for eg. If two genes coding for blonde hair and tall height separately but present on a same chromatid then they will recombine with the chromatid having respective alleles on non - homologous chromosomes at different time , as one chromatid can not perform two recombination at a same time , it was my opinion! $\endgroup$ Oct 30, 2023 at 16:37

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .