A) mutation
B) mitosis
C) meiosis
D) fertilization
Correct Answer: A
Solution :
Variations are the differences between organisms of same or different species. Variation in organism are caused by mutation, hybridization and crossing over. Mutations are the sudden and heritable changes in the gene or chromosome or an organism. They are caused by physical or chemical substance called mutagen. Mitosis is the common method of cell division in somatic cell. It involves division of the parental cell into two genetically identical daughter cells. Sexual reproduction involves the fusion of two specialized cells (gametes) to form the zygote (fertilization). Intact a special type of nuclear division (meiosis) prevents the number of chromosomes from getting doubled in each generation. Crossing over takes place during pachytene stage in meiosis-I.
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