How sexual reproduction creates genetic variation which is needed for better adaptation to changing environment? Provide a suitable explanation.

Explanation

Sexual reproduction increases genetic variation in offspring, which in turn increases the genetic variability in species.
INDEPENDENT ASSORTMENT OF CHROMOSOMES
Independent assortment occurs when homologous chromosomes separate during anaphase I of meiosis. The way the pairs are oriented during metaphase I, in one cell is different from the way they.re oriented in another cell. When the homologous chromosomes separate, many different combinations of homologous chromosomes can travel together toward the same side of the cell. (`2^23`—that.s 8,388,608) to be exact.
RANDOM COMBINATION OF GENES DURING FERTILIZATION

Fertilization produces random combinations of genetically diverse sperm and eggs, creating virtually unlimited possibilities for variation. Millions of genetically different sperm swimming toward an egg. Fertilization is random, so the sperm that wins the next race. And, of course, each egg is genetically different too.
NEW GENETIC COMBINATION DURING CROSSING-OVER
When homologous chromosomes come together during prophase I of meiosis, they exchange small segment of DNA with each other. This crossing Over results in new gene combinations and new chances for variety.
NONDISJUNCTION OF HOMOLOGOUS CHROMOSOMES
When chromosomes don.t separate the way they.re supposed to, that.s called nondisjunction. Occasionally, a pair of chromosomes don.t separate, and both members of the pair end up in the same gamete.