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question

I am a bit confused on this question in my Textbook (STD 12) and have got all sorts of answers on searching it but I am still not able to comprehend it literally. Can someone answer this and explain when and where do the two type of segregation - A & B take place. I do know the how part.

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    $\begingroup$ In the list of bad textbook questions, this one ranks in the top 5! The question is unclear (and I am voting to close the post as unclear), it is impossible to answer it. $\endgroup$ – Remi.b Oct 14 at 3:50
  • $\begingroup$ What if it comes in my examination? I do NEED to answer it , you know. I didn't really understand my teacher's explanation precisely why I posted it on StackExchange. $\endgroup$ – Sristy Oct 14 at 4:03
  • $\begingroup$ @Sristy Since the question asks "can you tell...?", they might accept "No, I can't tell for the following reasons:..." as a valid answer, if your reasoning is correct. $\endgroup$ – Arsak Oct 14 at 11:57
  • $\begingroup$ HaHa...I'm sure I can answer it like that if I am desperate for a 0. $\endgroup$ – Sristy Oct 16 at 17:53
  • $\begingroup$ You know, I really Dislike this about StackExchange.They shall all downvote your question but refuse to provide an answer.If you think the question is so simple, why didn't you even bother with a two-liner answer ? $\endgroup$ – Sristy Oct 16 at 17:54
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Hmm, very cryptical formulations! I decided that B represents the chromosome because of "one pair" vs "independent pairs": All chromosomes are independent but many genes lie on the same chromosome and are therefore not independent, ignoring crossing-over for now.

It holds as well for the second statement, since it's the chromosomes that segregate, taking all genes that lie on them with them at the same time.

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This NCERT question though... I guess they want us to take into account the phenomenon of linkage. If we do so, then genes on the same chromosome are not independent, but if they lie afar or lie on different chromosomes, then they can be said to be independent. Chromosomes have nothing as such and are always independent. Thus column A represents genes and column B represents chromosomes, the distinction made by the phrases "one pair" and "independent pair".

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