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natulia [17]
3 years ago
6

HELP!!!!!!!

Biology
2 answers:
levacccp [35]3 years ago
7 0

Answer:

The correct answer is option B (homologous chromosomes join together to form tetrads during prophase I).

Explanation:

Crossing over is a mechanism in which the genetic material is exchanged between 2 non-sister chromatids of homologous chromosomes.

It takes place by a process called synapsis which takes place during pachytene substage of prophase I during meiosis I when two homologous chromosomes, one from each parent pair with each other with the help of a protein-RNA structure called synaptonemal complex which forms tetrad.

During this, DNA sequences are exchanged between the homologous chromosomes producing recombinant chromosomes.

Thus, option B is the correct answer.

MariettaO [177]3 years ago
3 0
The answer to your question is B. Crossing over occurs when homologous chromosomes pair up and exchange genetic material at the chiasmata (site of exchange).
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