Question

What would be accomplished if crossing over occurred between sister chromatids? explain

Answer 1

Answer:

Since sister chromatids are identical, genetic variation will not be produced in the daughter cells.  

Explanation:

Sister Chromatid Exchange (SCE):

• This is a rare recombination phenomena that entails recombination and crossing over between two sister chromatids.
• This is contrary to normal recombination in which crossing over between non-sister chromatids takes place, producing genetically variable daughter cells.
• Exchange of genes between sister chromatids does not produce genetic variations.
• SCE is actually an indicator of chromosomal instability and DNA repair and replication malfunction.
• SCE is observed to be increased in pathological conditions like Bloom syndrome (genetic disorder) and Behcet disease (chronic inflammatory disorder) etc.