AP BIOLOGY

Detailed explanation-1: -Therefore, the chromosome number is halved in gametes to restore the normal number i.e. 2n after fertilization to form a zygote.

Detailed explanation-2: -During meiosis the cell produces gametes, or germ cells, each containing half the normal or somatic number of chromosomes. This condition is called haploidy. When two germ cells (e.g., egg and sperm) unite, the diploid condition is restored.

Detailed explanation-3: -Fertilization involves the fusion of two gametes, usually from different individuals, restoring the diploid state.

Detailed explanation-4: -This can be attributed to meiosis, which only reproductive cells can perform. When an egg cell is fertilized by a sperm cell, the chromosomes of the two cells combine, and the zygote becomes diploid, meaning it has the complete species number of chromosomes.

Detailed explanation-5: -Egg and sperm cells have just 23 chromosomes each. That’s half as many chromosomes as regular cells. Through the process of fertilization, egg and sperm join to make a cell with 46 chromosomes (23 pairs), called a zygote. For each chromosome pair, one homologous chromosome came from each parent.