PATHOLOGY

Detailed explanation-1: -Crossing over is a cellular process that happens during meiosis when chromosomes of the same type are lined up. When two chromosomes-one from the mother and one from the father-line up, parts of the chromosome can be switched. The two chromosomes contain the same genes, but may have different forms of the genes.

Detailed explanation-2: -The chromatin condenses into chromosomes. Homologous chromosomes containing the two chromatids come together to form tetrads, joining at their centromeres (2n 4c). This is when “crossing over” occurs, which creates genetic variation.

Detailed explanation-3: -Answer and Explanation: Crossing-over increases genetic variation by creating different chromosomes in offspring in comparison with their parents. The amount of genetic variation in a population is important because natural selection is dependent upon varying alleles to increase or decrease their frequencies.

Detailed explanation-4: -The answer to this question is Crossing over is important because it ensures genetic variability and contributes to genetic resortment which are the key factors to genetic diversity among offsprings that would otherwise lead to lot of abnormalities, genetic disorders.