NEET BIOLOGY

CELL STRUCTURES AND FUNCTION

CELL CYCLE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
What happens during crossing over?
A
Chromosomes collide
B
Chromosomes die
C
Chromosomes exchange genetic material
D
Chromosomes replicate
Explanation: 

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 exchange of genetic material (DNA) between the non-sister chromatids of the homologous chromosomes is known as crossing over. It leads to the recombination of genetic material which involves a mutual exchange of the corresponding segments of non-sister chromatids of homologous chromosomes.

Detailed explanation-3: -The exchange of genetic material between homologous chromosomes is referred to as crossing over. At prophase I of the meiosis, the homologous pair of the chromosomes interact with each other and exchange part of the genetic materials. This process is called crossing-over.

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