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Genetics Homeworkkk!!! PLEASE HELP

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

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Genetics Homeworkkk!!! PLEASE HELP

Postby els09011 » Thu Sep 13, 2012 1:09 am

Glowing Green Blood Degree 3 is a rare human disorder caused by recessive allele - ggb3. the normal allele is GGB3 dominant. the gene for this disease is located on the human chromosome #1p, a large metacentric chromosome. The sex chromosomes in humans are the X and Y. A man who is a carrier for Glowing Green Blood Degree 3, but does not have the disease himself, inherited his ggb1 allele from his mother. Using the Genotype of this man, and only considering chromosomes #1, X, and Y, draw the correct configuration of chromosomes for Metaphase of Mitosis and one possibility for Metaphase of Meiosis 1. Shade in the paternal chromosomes and label the appropriate chromatid with the correct gene symbol for the Glowing Green Blood Degree 3 allele it carries. Be sure to label each allele and each chromosome. Do not show crossing over in this assignment.

I get the basic concept but im having trouble writing out where the alleles are placed on the chromosomes. Can anyone help?!
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Postby Cat » Thu Sep 13, 2012 2:44 am

You simply need to make your drawings and place this gene on the short (p) arm of a chromosome keeping in mind to id recessive allele as maternal in origin and the normal on is paternal.
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Re: Genetics Homeworkkk!!! PLEASE HELP

Postby david23 » Fri Sep 14, 2012 11:03 pm

els09011 wrote:Glowing Green Blood Degree 3 is a rare human disorder caused by recessive allele - ggb3. the normal allele is GGB3 dominant. the gene for this disease is located on the human chromosome #1p, a large metacentric chromosome. The sex chromosomes in humans are the X and Y. A man who is a carrier for Glowing Green Blood Degree 3, but does not have the disease himself, inherited his ggb1 allele from his mother. Using the Genotype of this man, and only considering chromosomes #1, X, and Y, draw the correct configuration of chromosomes for Metaphase of Mitosis and one possibility for Metaphase of Meiosis 1. Shade in the paternal chromosomes and label the appropriate chromatid with the correct gene symbol for the Glowing Green Blood Degree 3 allele it carries. Be sure to label each allele and each chromosome. Do not show crossing over in this assignment.

I get the basic concept but im having trouble writing out where the alleles are placed on the chromosomes. Can anyone help?!


\ you just need to label things, no where does it say you have to write where the allele are on the chromosomes.
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Postby runaway » Sat Nov 03, 2012 9:33 pm

Hi!
I need your help with this problem:

How many different gametes does tetrahybrid create if two locuses are totally tied and other two locuses have independent segregation? How many genotips can that tetrahybrid give with self-fertilization?

I am not sure if I translated that right but I hope you will understand what is it about..
Thanks!
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Postby JackBean » Sat Nov 03, 2012 10:41 pm

Such tetrahybrid would behave like trihybrid, because the two loci are like one (with very, very, very rare cases of crossing-over in between)
http://www.biolib.cz/en/main/

Cis or trans? That's what matters.
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Re: Genetics Homeworkkk!!! PLEASE HELP

Postby runaway » Mon Nov 05, 2012 9:17 pm

Thank you!
I have one more problem:

If parents are heterozygous and they have five children, what is the possibility of having the first and the fifth child with sickle-cell anemia?
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