AP BIOLOGY

Detailed explanation-1: -Crossing over occurs when the two homologous chromosomes break and then reconnect to different end pieces. If the chromosomes break at the same locus in the base pair sequence it results in the exchange of genes and is called recombination.

Detailed explanation-2: -Crossing over can cause new gene combinations to occur on a chromosome if the crossover occurs between the linked genes. When a crossover occurs between genes, chromatids with both the parental combination and chromatids with a new combination will be made.

Detailed explanation-3: -Genetic recombination happens as a result of the separation of genes that occurs during gamete formation in meiosis, the random uniting of these genes at fertilization, and the transfer of genes that takes place between chromosome pairs in a process known as crossing over.

Detailed explanation-4: -When chromosomes cross over, two different chromosomes trade pieces of genetic information during prophase I of meiosis. If the linked genes are far apart on the chromosome, it is more likely that crossing over will separate them.