Use the following information as the basis tions metacentric A diploid eukaryoti

Question

Use the following information as the basis tions metacentric A diploid eukaryotic organism has 3 unique chromosomes. Chromosome I is a Ill is a submetacentric chromosome, chromosome II is a telocentric chromosome, and Chromosome chromosome. cell cycle? 1. How many total chromosomes do somatic cells of this organism have in G1 of 2. How many total DNA molecules do somatic cells of this organism have in G1 of cell cycle? 3. How many total chromosomes do the somatic cells of this organism have in G2 of cell cycle? 4. How many total DNA molecules do the somatic cells of this organism have in G2 of cell cycle? 5. Draw the chromosomes in G1 and in G2 and label all parts. 6. Draw a detailed picture of a germ cell from this organism in Metaphase of Mitosis and label all chromosomal and cellular components

Explanation / Answer

1. In G1 of somatic cell, there must be 3 pairs chromosomes

2. No. of DNA must be 12(3 pairs=6 in no.*2, i.e. 12 DNA)

3. same as G1=3 pairs or 6 in no (though the no of chromosomes are counted according to the no of centromere, so all chromosomes are doubled but attached at the same centromere)

4. No. of DNA must be doubled i.e. 12*2=24

5.

6.

7. the no. of chromosome in metaphase of meiosis I will be 3 pairs or 6 in no but all are duplicated

8. the no of chromatids in metaphase of meiosis I = 2* no. of chromosome= 12 chromatids

9. though germ cells are diploid and in metaphase of meiosis I, there must be 2 in no. or 1 pair which is duplicated,

10.

11. 6 no of chromosome and haploid must be present in anaphase of meiosis II

12. 6 chromatids must be present in anaphase of meiosis II

13.2 no. of telomeres must be present in anaphase of meiosis II

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