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question about inheritance of chromosomes

Genetics as it applies to evolution, molecular biology, and medical aspects.

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question about inheritance of chromosomes

Postby earthlyillusion » Wed Jun 10, 2009 8:29 am

Hi,
My biology class and I are stumped on a question regarding the inheritance of chromosomes and our teacher claims it's 'ridiculously easy' but yet, we keep doubting and second guessing ourselves.

The question asks about the inheritance of chromosomes through grandparents. Is it possible that a child can inherit at least one chromosome from their father's father? We originally believed yes, as the father obviously received chromosomes from his father but now we doubt it, remarking that obviously genes can be and are inherited but can a whole chromosome pass from a grandfather to his grandson?

My teacher's remark about it being an easy question leads me to believe we are meant to ignore the concept of crossing over during meiosis and simply respond with a yes and the reasoning I mentioned above.

I was just curious to know what you all thought.

Thanks in advance.
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Postby wbla3335 » Wed Jun 10, 2009 1:13 pm

Is there any chromosome that does not pair with a homologue where recombination could occur? Remember, the question is asking about the child's father's father.
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Re: question about inheritance of chromosomes

Postby HenryHR » Wed Jun 10, 2009 2:52 pm

Yeah,until there is a chromosome that does not crossover with its homolog chromosome.But I am afraid there is not a chromosome like this ~
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Re: question about inheritance of chromosomes

Postby jonmoulton » Wed Jun 10, 2009 4:37 pm

Ah, but can there be a pair of chromosomes that is not a truly homologous pair? Consider overall shapes...
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Postby Darby » Thu Jun 11, 2009 2:31 am

You need a better idea of what distinguishes genes and chromosomes. If you're straight on that, it is very easy.
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Postby jonmoulton » Fri Jun 12, 2009 3:09 pm

Assuming normal rates of crossover, we can say unambiguously whether or not a child will have inherited an intact chromosome (without recombination) from the child's paternal grandfather. All we need to know in order to answer the question is the sex of the child.
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Re: question about inheritance of chromosomes

Postby TMK » Mon Jun 15, 2009 5:53 pm

If the child is a boy - then he has inherited his father's father (paternal grandfathers) Y chromosome
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