Question

Which correctly describes crossing over?

Answer 1

Crossing over is the process whereby homologous chromosomes are pulled to opposite poles of the cell.

Answer 2

                          Crossing over

• Normally, the chromosomes that are present in a body has basic structure of genes and each of the genes are are kept apart by the chromosomes at a certain distance.
• But sometimes when the distance between two genes is slightly more than usual, the genes carried by two different chromosomes can have a process of crossing over take place among them.
• The assortment of two genes in a chromosome takes place independently but when meiosis is taking place the genes are said to be linked with each other.
• So if the genes present in chromosomes are close enough then the percentage of crossing over of those deans becomes less.

To know more:

Crossing over that results in genetic recombination in higher organisms occurs between

(1) Non sister chromatids of a bivalent

(2) Two daughter nuclei

(3) Two different bivalent

(4) Sister chromatids of a bivalent

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