the diploid phase in the life cycle of a sexually reproducing organism is restored by:
a)mitosis
b)meiosis
c)amitosis
d)fertilization
Answers
Answer:
d) fertilization
Explanation:
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I mean that how it all starts
Answer:
d) fertilization.
Explanation:
a) Mitosis: Mitosis is a process in which a parent(diploid) cell divides into two identical daughters (diploid) cells. These cells are identical to each other as well as the parent cell. It is a type of division in which already duplicated chromosomes are distributed into two daughter cells equally so that both the cells have the same number of chromosomes. It is also called equational division because the two daughter cells have the same number of chromosomes as that present in the parent cell. Hence, the option is Incorrect.
b) Meiosis: Meiosis is a process in which a diploid parent cell forms four haploid daughter cells. It involves two sequential cycles of nuclear division but only one cycle of DNA replication due to which four haploid cells are formed. It is also called reductional division because, during this division, the chromosome number is reduced to half of the parent cell. Hence, the option is Incorrect.
c) Amitosis: Amitosis is a process in which the nucleus and the cytoplasm of the parent cell divide simultaneously only once to produce two daughter cells. It is also called direct cell division and it is found mainly in prokaryotes and lower eukaryotes. Hence the option is Incorrect.
d) Fertilization: Fertilization is a process in which two haploid cells (eg- sperm and ovum) are fused to form a diploid cell (Zygote), thus it restores the diploid phase in the life cycle of the sexually reproducing organism. Hence, the option is Correct.