HEREDITY
NONDISJUNCTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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G1 phase, interphase II
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G1 phase, interphase
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S phase, interphase
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G2 phase, interphase
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Detailed explanation-1: -In the eukaryotic cell cycle, chromosome duplication occurs during “S phase” (the phase of DNA synthesis) and chromosome segregation occurs during “M phase” (the mitosis phase).
Detailed explanation-2: -S phase is the period during which DNA replication occurs.
Detailed explanation-3: -During the S phase, DNA is duplicated into two sister chromatids, and centrosomes, which give rise to the mitotic spindle, are also replicated. In the G2 phase, energy is replenished, new proteins are synthesized, the cytoskeleton is dismantled, and additional growth occurs.
Detailed explanation-4: -S phase is the period of wholesale DNA synthesis during which the cell replicates its genetic content; a normal diploid somatic cell with a 2N complement of DNA at the beginning of S phase acquires a 4N complement of DNA at its end.
Detailed explanation-5: -S phase : The replication phase is known as the S phase. DNA replication consumes the majority of the cell’s resources. All 46 chromosomes are duplicated in human cells.