2. All of the following are true of crossing over, EXCEPT

crossing over occurs immediately after an egg is fertilized.

homologous chromosomes exchange genetic material.

crossing over results in unique combinations of alleles.

crossing over occurs during meiosis I.

crossing over occurs only in cells destined to become sperm or egg.

Meiosis is also known as reduction division. Meiosis is the process of cell division by which a parent cell divides to give four daughter cells each with half number of chromosomes.

Crossing over may occur during meiosis I of the cell cycle. Crossing over will not occur in the cells immediately after the fertilization of egg and zygote restores the original number of chromosomes.

Thus, the correct answer is option (1).

luisvaschetto luisvaschetto · Answer 2 · 2021-11-11T12:55:47+01:00

The statement 'crossing over occurs immediately after an egg is fertilized' is NOT true.

Crossing over, also called recombination, occurs in meiosis, a type of reductional cell division by which one parental cell divides to produce four gametes (germinal cells) having half of the genetic material.

Crossing over specifically occurs during the first phase of Meiosis I i.e., during Prophase I.

This process (crossing over) increases the genetic variation of the resulting germinal cells (either spermatic or egg cells).

In conclusion, the statement 'crossing over occurs immediately after an egg is fertilized' is NOT true.

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