AP BIOLOGY

Detailed explanation-1: -Exchange of segments between non sister chromatids of homologous chromosomes is called crossing over. It occurs during pachytene stage of prophase I in meiosis.

Detailed explanation-2: -Crossing-Over. Crossing-over occurs during prophase I, and it is the exchange of genetic material between non-sister chromatids of homologous chromosomes.

Detailed explanation-3: -Crossing over occurs between prophase I and metaphase I and is the process where two homologous non-sister chromatids pair up with each other and exchange different segments of genetic material to form two recombinant chromosome sister chromatids.

Detailed explanation-4: -Non – sister chromatids are a pair of homologous chromosomes having different alleles. When crossing over occurs chiasma is formed which is the point of contact between the non-sister chromatids which results in the exchange of genetic material.

Detailed explanation-5: -Crossing over, as related to genetics and genomics, refers to the exchange of DNA between paired homologous chromosomes (one from each parent) that occurs during the development of egg and sperm cells (meiosis).