Physics, Chemistry and Biology: Post your doubts here!

sj0007

sj0007

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Umm.......in bio paper 6 whenever they ask us to describe an experiment that has some safety measures as well, I can write more than one, right??? I just want someone to confirm it!!! Thnx............. :)
 
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Ahmed Elsiddig

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semsemhosam said:
Assalam-o-Alaikum.
Post your Physics, Chemistry and Biology doubts in here and members, along with me will try their best to help you out. :)
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Why is sickle cell Anemia common in areas where Malaria is common? and Why is Sickle cell anaemia not common in place where there is malaria?
 
sj0007

sj0007

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Ahmed Elsiddig said:
Why is sickle cell Anemia common in areas where Malaria is common? and Why is Sickle cell anaemia not common in place where there is malaria?
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Sickle cell anaemia is when the person has the abnormal form of haemoglobin causing them to be sickle shaped...........
This sickle shaped gives the cells an advantage of not getting malaria cuz the mosquito (or whoever) cant survive on them.............
Normally this disease should have been out cuz of natural selection cuz the people with this disease tend to die but that did not happen cuz of malaria
So, sickle cell anaemia carriers (heterozygous) are resistant to malaria and so this is common in parts where malaria is......
Sickle cell anaemic people die, people with malaria die (the normal ones), leaving them to pass on the allele
 
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Ahmed Elsiddig

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sj0007 said:
Sickle cell anaemia is when the person has the abnormal form of haemoglobin causing them to be sickle shaped...........
This sickle shaped gives the cells an advantage of not getting malaria cuz the mosquito (or whoever) cant survive on them.............
Normally this disease should have been out cuz of natural selection cuz the people with this disease tend to die but that did not happen cuz of malaria
So, sickle cell anaemia carriers (heterozygous) are resistant to malaria and so this is common in parts where malaria is......
Sickle cell anaemic people die, people with malaria die (the normal ones), leaving them to pass on the allele
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in paper 61 they told us to label xylem nd phloem
 
skyangel

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I have a problem in physics paper 3 the question is
The coil in part (a) that is the coil wire connected to a rheostat and a battery has a pd of 1.8v
Its then replaced by coil of half the diameter of that in a
When pd across is again 1.8v the current only 0.30a

Calculate how the length of wire in the second coil compares with the length of wire in the first coil

Note that the first part of coil have told in first sentence

Plzzz help me guys I giving my physics exam on may 20 th
 
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masterex567

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skyangel said:
I have a problem in physics paper 3 the question is
The coil in part (a) that is the coil wire connected to a rheostat and a battery has a pd of 1.8v
Its then replaced by coil of half the diameter of that in a
When pd across is again 1.8v the current only 0.30a

Calculate how the length of wire in the second coil compares with the length of wire in the first coil

Note that the first part of coil have told in first sentence

Plzzz help me guys I giving my physics exam on may 20 th
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paper year nd variant?
 
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