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Biology
GCSE

What is meant by the term genotype and how does this differ from the phenotype?

The genotype of an organism is the combination of alleles, different copies of a gene at the same locus, (from the mother and father) that give rise to a particular trait whereas the phenotype is the obse...

Answered by Lucy S. • Biology tutor
2368 Views

How do vaccines prevent certain diseases?

Vaccines introduce a dead, inactive or altered form of a pathogen (a microbe that causes an infectious disease) into the body. These pathogens have antigens,

Answered by Alice M. • Biology tutor
2003 Views

Explain why the balloons inflate in the bell jar model of the lungs, when the rubber sheet is pulled down. (3 marks)

When the sheet is pulled down, the volume in the jar increasesThis causes the pressure in the jar to decreaseTherefore, air enters the balloon, down the pressure gradient, causing the inflation.

Answered by Manaswini P. • Biology tutor
12660 Views

What’s the difference between mitosis and meiosis?

Mitosis is a type of cell division in which a cell divides to form two cells that are genetically identical to the original cell and each other. During the cell cycle, the cell’s amount of genetic materia...

Answered by Rebecca D. • Biology tutor
2525 Views

A student wants to study red blood cells beneath a microscope. She is not sure which solution she should use to observe such cells. In solution A, she sees figure A (plasmolysis) and in solution B she sees nothing. Can you explain her observations?

Solution A - plasmolysis. The red blood cells were in an hypertonic solution (solution had a lower water potential than the red blood cells due to increased concentration of solute) thus water molecules m...

Answered by Roxy F. • Biology tutor
2355 Views

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