Question

The chart below refers to meiosis in a diploid individual composed of cells with 10 chromosomes during the G1 phase.  Fill in the missing meiotic stage, description of major event during that stage, or # of chromosomes/# of DNA molecules.

Phase of Meiosis	Description of major event	# of chromosomes/# of DNA molecules
	Replicated chromosomes align midway between spindle poles	5 chromosomes / 10 DNA molecules
	Earliest stage of meiosis at which homologous chromosomes are paired
Immediately following Telophase I
Anaphase I
		10 chromosomes / 10 DNA molecules
Metaphase I
	Replicated chromosomes re-condense after reductive division

So that chart starts out by saying that a cell has 10 chromosomes in G1 phase of the cell cycle. Remember that G1 precedes meiosis I. Saying that the cell has 10 chromosomes in G1 is saying that the diploid number of chromosomes in 10. Another way to say it is that there are 5 homologous pairs of chromosomes.   

So 5 is the haploid number. The point of meiosis is to make haploid gametes (sperm or egg cells). And the transition from diploid to haploid comes as the cell completes telophase I. So cells are diploid throughout meiosis I; then they are haploid throughout meiosis II.

The goal of meiosis II is to convert a haploid number of replicated chromosomes into a haploid number of unreplicated chromosomes (this involves the separation of sister chromatids in anaphase II).

Answer 1

phases of meiosis	Description of major event	# of chromosomes/# of DNA molecules
metaphase ll	replicated chromosome align midway between spindle poles.	5 chromosomes / 10 DNA molecules
prophase l	Earliest stage of meiosis at which homologous chromosomes are paired	10 chromosome/20 DNA molecule
Immediately following Telophase I	nuclear membrane and nucleolus reappear, cytokinesis follows forming diad of the cell,and is followed by short stage of intekinesis	5 chromosome/ 10 DNA molecules
Anaphase l	the homologous chromosome gets separated while sister chromatids remain associated.	10 chromosome/20 DNA MOLECULES
anaphase ll	splitting of centromere of each chromosome to separate the sister chromatids	10 chromosomes / 10 DNA molecules
Metaphase l	the bivalent choromosme align on the equatorial plate and the spindle from opposite pole attaches to the pair of homologous chromosome.	10 chromosome/ 20 DNA molecule
prophase ll	Replicated chromosomes re-condense after reductive division	5 chromosome / 10 DNA molecule