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lana66690 [7]
3 years ago
13

In 1909, cytologist Frans Janssens described microscopic chromosomal structures that were viewed during prophase I of __________

__ ; he called these structures ____________
Biology
1 answer:
gayaneshka [121]3 years ago
3 0

Answer:

meiosis; chiasmata

Explanation:

The linkage between two non-sister chromatids of homologous chromosomes can be seen in the diplotene stage of prophase I of meiosis which is called chiasmata.

This phenomenon is discovered in 1909 by a  Frans Janssens who called the structure chaismata. Chaismata allows the exchange of genes between two homologous chromosomes which came from two parents.

In the pachytene stage crossing over between non-sister chromatids takes place. This crossing over helps in increasing the genetic variability in the gametes and offspring.  

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