AP BIOLOGY

Detailed explanation-1: -The exchange of segments of non-sister chromatids between chromosomes of a homologous pair is termed as crossing over. Additional Information: Transformation: It is the genetic modification of a cell because of the direct uptake and merger of external genetic material from its surroundings through the cell wall.

Detailed explanation-2: -Definition. 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).

Detailed explanation-3: -Crossing over is the exchange of genetic materials between non-sister chromatids of homologous chromosome. It takes place at pachytene stage of prophase-I.

Detailed explanation-4: -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-5: -The correct option is A True. Crossing over: Homologous chromosomes are the set of chromosomes from both father and mother that pair up with each other during meiosis. The non-sister chromatids of this tetrad cross each other forming chiasmata.