Question

following s phase, a human cell would have how many pairs of sister chromatids and individual dna molecules? multiple choice 46 pairs of sister chromatids and 92 individual dna molecules 46 pairs of sister chromatids and 184 individual dna molecules 23 pairs of sister chromatids and 92 individual dna molecules 23 pairs of sister chromatids and 46 individual dna molecules 46 pairs of sister chromatids and 46 individual dna molecules

Explanation:

Step1: Human cell chromosome count

A human somatic cell has 46 chromosomes (23 pairs) before S phase.

Step2: DNA replication in S phase

Each chromosome replicates into 2 sister chromatids (1 pair per chromosome). So 46 chromosomes → 46 pairs of sister chromatids.

Step3: DNA molecule count

Each chromatid has 1 DNA molecule. 46 pairs = 92 chromatids → 92 DNA molecules.

Answer:

46 pairs of sister chromatids and 92 individual DNA molecules