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Amy has cystic fibrosis which is caused by a recessive allele. Her partner is heterozygous for cystic fibrosis. What is the chance that her future child has cystic fibrosis?

Alleles are different forms of a gene which can become mutated to cause different characteristics or diseases. They can be dominant (usually denonimated by a captial letter H) or recessive (usually denominat...
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Answered by Rebecca M. • Biology tutor
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How may cells be specialised to their function?

Despite animal cells all having a nucleus (for genetic information storage and reproduction), a cytoplasm (for structure), mitochondria (for aerobic respiration), ribosomes (for protein synthesis) and a cell...
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Answered by Alec M. • Biology tutor
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Describe how a new phenotype may arise in the population and increase in frequency using the theory of natural selection.

A mutation arises in an individual that confers a selective advantage. The phenotype the mutation produces is selected for by natural selection and so the individual survives to reproductive age. This mutati...
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Answered by Katy A. • Biology tutor
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Name and briefly describe the function of three organelles possessed by a plant cell. State an organelle that is present in a plant cell but not in an animal cell.

Plant cells possess a membrane bound nucleus that acts as the control centre of a cell. They also possess a vacuole which controls water balance in the cell. The chloroplasts are the site of photosynthesis a...
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Answered by Katy A. • Biology tutor
3986 Views

How do antibodies work?

Foreign cells that enter the body have antigens on the outside of them which will be complementary to a specific antibody. The antibody can bind to the antigen, forming an antigen-antibody complex, and this ...
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Answered by LORNA B. • Biology tutor
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