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Chromosomes

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Chromosomes

Postby Mstar888 » Fri Apr 08, 2005 10:19 pm

I need some help;
How many chromosomes are in (human):
Liver cell? Sperm cell? heart muscle cell? egg cell?
How many long chromosomes are present in each new cell formed by meiosis?
How many short chromosomes present in each new cell formed by meiosis?
Are the chromosomes in pairs in the new cells?
How many pairs of chromosomes are in each human body (somatic) cell?
How many pairs of chromosomes in each egg/sperm?
Thanks. :D
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Postby mith » Sat Apr 09, 2005 1:08 am

46,46,23,46,23,23(assuming you mean long/short arms),23,no,46,23.
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Postby Poison » Sat Apr 09, 2005 2:16 pm

1-How many pairs of chromosomes are in each human body (somatic) cell?
2-How many pairs of chromosomes in each egg/sperm?


1- It says pairs, mithrilhack. there are 22 pairs in male and 23 pairs in female. (44+XX (female) or 44+XY (male) )
2-you cannot find chromosomes in pairs in egg or sperm. They are single.
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Postby biostudent84 » Sat Apr 09, 2005 2:47 pm

In a male, the X any Y chromosomes are considered a pair.
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Postby mith » Sat Apr 09, 2005 4:23 pm

Ay, thanks for reading the question carefully poision :oops:
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Postby MrMistery » Sat Apr 09, 2005 7:59 pm

Always read the question carefully!!
By the way Poison: x and y are considered a pair, as kyle said
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Postby Poison » Sat Apr 09, 2005 10:20 pm

That was what my genetics professor said, but may be wrong.
Why are they considered as pairs?
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Postby biostudent84 » Sun Apr 10, 2005 12:20 am

Because they both are sex chromosomes. If you look at a keryotype of a human male, you'll see them listed as Chromosome Pair 23.
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Postby Poison » Sun Apr 10, 2005 8:27 pm

Yes. You are right. I just wonder why my genetics prof told that they are not. Maybe I can ask him sometime...
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Postby Johugh » Mon Apr 11, 2005 6:02 pm

Can you telll me the origin of sickle cell in west Africa Mediterranean what disease was it borne in respounse to
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Postby canalon » Mon Apr 11, 2005 8:14 pm

Johugh wrote:Can you telll me the origin of sickle cell in west Africa Mediterranean what disease was it borne in respounse to


SIckle cell anemia is linked to a mutation of hemoglobin. Diseased people are homozygotic for this mutation. Heterozygotes have a partial resistance to malaria, hence a the high selective pressure in favor of this gene in the population in spite of its huge selective cost.

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Postby Johugh » Tue Apr 12, 2005 6:23 pm

thanks Canalon thought malaria just needed conformation . big help!
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