BIO HELP Chromosome count

[MsDoC19]

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Please help...

1)If a cell with 32 chromosomes divides by meiosis, how many chromosomes will each nucleus contain at telophase I? (Assume cytokinesis has occurred.)
ANS: 16
[why not 32]

2)Following the same cell in the previous question, how many chromosomes will each nucleus contain at telophase II?
ANs: 16

3)If gametes have 8 chromosomes, the cell resulting from syngamy will have ________ chromosomes.
ANS: 8
[WHY NOT 16??]

4.)If a zygote has 4 chromosomes, the somatic cells formed from it have _______________ chromosomes.
ANS:4
[why not 2]

...SOMEONE PLZ EXPLAIN THANKS
😱

 

[hausee]

It is pretty clear for Q 1 and 2. Review meiosis will help more than I just tell you the answer.

For 3, will have 16 chromosomes, or 8 pairs(homologous chromosomes). syngamy=union of two gametes
for 4, zygote-->somatic cell through mitosis, so cells devided form it will have same number of chromosome as zygote, thus 4.

 

[UCB05]

Please help...

1)If a cell with 32 chromosomes divides by meiosis, how many chromosomes will each nucleus contain at telophase I? (Assume cytokinesis has occurred.)
ANS: 16
[why not 32]

2)Following the same cell in the previous question, how many chromosomes will each nucleus contain at telophase II?
ANs: 16

3)If gametes have 8 chromosomes, the cell resulting from syngamy will have ________ chromosomes.
ANS: 8
[WHY NOT 16??]

4.)If a zygote has 4 chromosomes, the somatic cells formed from it have _______________ chromosomes.
ANS:4
[why not 2]

...SOMEONE PLZ EXPLAIN THANKS
😱

Chomosomes are not considered independent entities until the proper anaphase which separates sister chromatids from each other.

1. At the end of Telophase I / Meiosis I, 32 chromosomes line up into 16 pairs of homologous chomosomes and separate, 16 each daughter cell. each of these chromosomes consists of a pair of sister chromatids which are not considered separate chromosomes, so the count remains at 16. Also, the assumption is important, as it means the chromosomes are properly separated. If cytokinesis has not occured, the 32 chromosomes would be split but still within the same cell and the answer would be 32.

2. At the end of Telophase II/ Meiosis II, each of those 16 pairs of sister chromatids separate into individual chromosomes. The exact point when they are considered separate is during Anaphase II, in which case the dividing cell has 32 chromosomes (from what used to be 16 pairs of sister chromatids). At the end of telophase II, two cells are created, each with 16 chromosomes.

3. If the gametes have 8 chromosomes, the result of syngamy is 16 chromosomes. The answer should be 16 unless the question meant to ask for # of pairs of homologous chromosomes.

4. The zygote is the 2n cell resulting from fertilization. somatic cells are the result of mitosis from the original zygote and are also 2n. The two will have the same chromosome count.

 

[MsDoC19]

THANK YOU BOTH SO MUCH!!

;]

its a lot clearER

😉

grrr hate meiosis / mitosis!!!

 

[UCSD6]

Hey Guys,
Just got done,what do u guys thing????, Freekin QR. Wonderful breakdown coming soon

Gen Chem: 19
Bio: 20
O-chem: 23
PA: 21
RC:20
QR: 15 (s**t)
TS: 21
AA:19

 

[hausee]

nice, waiting for your break down? R u in UCSD too?