4) Determine the diploid number (2n) of the following unknown organisms from the

Question

4) Determine the diploid number (2n) of the following unknown organisms from the cell observations given below. Draw what each cell looks like at the indicated stage, including all important cytological features.

a. 6 tetrads at metaphase I
b. 8 pair of sister chromatids in one of the two cells at anaphase II
c. 7 chromosomes within one gamete

If you could do the drawings somehow it would help out a lot.
I think the 2n numbers are
a) 2(6)= 12
b) 2(8)= 16 If this isn't correct could you please explain why
c) 2(7)= 14 If this isn't correct could you please explain why

Explanation / Answer

A tetrads consists of 4 chromatids. So 6 tetrads has a total of 24 chromatids. Since each chromosome consists of two chromatids divide by 2 to get 12 as the diploid number for a. b. Each pair of sister chromatids means 8 chromosomes and since it is in anaphase II that means it should be half of the diploid # so diploid # is 16. c. One gamete contains half the # of chromosomes in a diploid cell so diploid # is 14. You are correct in all your answers

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