Explain Crossing Over In Meiosis. ♦ crossing over is simply the exchange of genetic material between two homologous chromosomes to give rise to recombinant chromosomes. Meiosis is the formation of egg and sperm cells.

In prophase i, homologous chromosomes align lengthwise or pair with each other, and exchange of genetic material between the two chromosomes takes place, which is known as crossing over. This means that meiosis can result in almost an infinite amount of genetic variety. During meiosis, there is an important step to genetic variation.

Explain Jim Crow Laws. Johnson tried to bury jim crow by signing the the voting rights act of 1965 into law. Although a minority of white southerners w.

Others detailed social opportunities that would promote white supremacy, while deliberately stifling black progress. The meaning of jim crow is racial segregation and discrimination enforced by laws, customs, and practices in especially the southern states of the u.s. “it shall be unlawful for a negro and white person to play together or in company with each other in any game of cards or dice, dominoes or checkers.”.