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What is non-disjunction? How can this lead to changes in chromosome number?

Non-disjunction is the failure of chromosome pairs to separate properly during meiosis. This failure of separation usually occurs either in meiosis I (in anaphase I) or in meiosis II (in anaphase II). The co...
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Answered by Katy W. • Biology tutor
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How does evolution occur by natural selection?

Over time many theories have been put forward by the scientific community about how the process of evolution occurs. However the most commonly accepted theory amongst scientists is that evolution occurs by t...
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Answered by Katy W. • Biology tutor
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How do the hydrophobic and hydrophilic properties of phospholipids help maintain the structure of cell membranes?

The cell membrane is comprised of molecules with a phosphate head and hydrocarbon tail. The phosphate heads are polar, therfore they are hydrophilic and form favourable interactions with water, so line the o...
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Answered by Alexis B. • Biology tutor
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What is Homeostasis and how does it work?

To understand homeostasis we first need to understand the meaning- the definition buzz phrase for this word is "the maintenance of a constant internal environment". Therefore it refers to the proce...
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Answered by Elspeth B. • Biology tutor
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Explain how the lungs are adapted for gaseous exchange.

The lungs are made up of tiny sacs called alveoli which presents a very large surface area for gaseous exchange. The lungs are well supplied with blood due to lots of capillaries covering the alveoli, consta...
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Answered by Jonathan T. • Biology tutor
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