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Biology
A Level

What's the difference between meiosis and mitosis?

They are both cell divisions but there are major differences betwenn them. First of all, meiosis only happens in sex cells (egg cells in women and sperm cells in men) and is a reduction diviosion, i.e....

MT
Answered by Magdalena T. Biology tutor
4021 Views

What are the three isolation barriers by which speciation can occur?

Speciation is a complex topic, and indeed what defines a species is still debated today. However, one factor is key to the process of speciation; gene flow. Gene flow between populations of a species e...

JM
Answered by John M. Biology tutor
16689 Views

Outline how cystic fibrosis leads to recurrent lung infecions

   Cystic Fibrosis is a genetic condition that results from defective chloride ion channels. Normally a protein known as the “Cystic Fibrosis Transmembrane conductance Regulator” (CFTR) transports chlo...

VN
Answered by Vinayak N. Biology tutor
5372 Views

What causes the condition Cystic Fibrosis?

Cystic Fibrosis is caused by a mutation in the CFTR gene. The mutation causes a small change in the DNA's base sequence which codes for a different sequence of amino acids and therefore as a result, th...

YM
Answered by Yasmin M. Biology tutor
4459 Views

How do plant stomata open and close?

Stomata can be thought of as gates. This is why the size of the guard cells is so important. How the guard cells change in size is a simple matter of how much fluid they can hold - their turgor. Osmosi...

SM
Answered by Sarah M. Biology tutor
45172 Views

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