Crossing over occurs when

a.) sister chromatids are pulled apart at the centromere during anaphase II.

b.) homologous chromosomes join together to form tetrads during prophase I.

c.)chromosomes are grouped together into new nuclei during telophase II.

d.) tetrads of homologous chromosomes randomly line up in metaphase I.

Question

Crossing over occurs when 

 a.) sister chromatids are pulled apart at the centromere during anaphase II. 

 b.) homologous chromosomes join together to form tetrads during prophase I. 

 c.)chromosomes are grouped together into new nuclei during telophase II.
 
  

 d.) tetrads of homologous chromosomes randomly line up in metaphase I.

anonymous · Answer

Cross-over is a gene swapping process that occurs only in meiosis at prophase-1.

anonymous · Answer

So B? I'm honestly so bad at science and don't understand anything, just which question is correct.

anonymous · Answer

tetrads means a group so if they are all coming together, they would form a group so yes you are correct

anonymous · Answer

Cool thanks for your help!