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Multiple Choice
The diploid phase of the human life cycle begins with _____.
A
gamete formation
B
mitosis
C
fertilization
D
meiosis
Verified step by step guidance
1
Understand the human life cycle phases: the diploid phase and the haploid phase. The diploid phase contains two sets of chromosomes (2n), while the haploid phase contains one set (n).
Recall that gametes (sperm and egg) are haploid cells produced by meiosis, each containing a single set of chromosomes (n).
Recognize that fertilization is the process where two haploid gametes fuse to form a diploid zygote, restoring the two sets of chromosomes (2n).
Identify that the diploid phase begins at fertilization because this is when the zygote with a full set of chromosomes is formed.
Note that mitosis occurs after fertilization to allow the diploid zygote to grow and develop, but the diploid phase itself starts at fertilization.