The diploid number of the hypothetical animal Geneticus intr

The diploid number of the hypothetical animal Geneticus introductus is 2n = 28. Each diploid nucleus contains 1 ng of DNA in G_1. What amount of DNA is contained in each nucleus at the end of S phase? There are 28 chromosomes containing 2 ng of DNA. There are 14 chromosomes containing 0.5 ng of DNA. There are 28 chromosomes containing 1 ng of DNA. None of the above. Write the number of chromosomes and amount of DNA (ng) present per cell at the end of Telophase I of meiosis (after cytokinesis). Express your answer as two numbers separated by a comma. Write the number of chromosomes and amount of DNA (ng) present per cell at the end of Anaphase of mitosis. Express your answer as two numbers separated by a comma. Write the number of chromosomes and amount of DNA (ng) present per cell at the end of Telophase II of meiosis (after cytokinesis). Separate your two answers by a comma. For the amount of DNA, use two significant figures.

Solution

Part A:
There are 28 chromosomes containing 2ng of DNA(because dna replicates in the S phase).

Part B:
There are 14 chromosomes and contaning 1ng of DNA(because at the end of meiosis1 DNA remain same whereas the chromosome number is reduced to half)

Part C:
There are 56 chromosomes and contaning 2ng of DNA(because each chromatid is considered as a chromosome after anaphase and thus the number doubles and DNA as we know remains same from that of S phase)

Part D:
There are 14 chromosomes and contaning 0.5ng of DNA(because after meiosis2 the number of chromosomes and DNA both gets halved)