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1. Polydactyly is caused by a dominant allele, D. The recessive allele of the gene is represented by d. Use one genetic diagram to show the inheritance of the polydactyly gene by R and S.

P generation Father (P) Mother(Q) Phenotype Polydactyly Normal Genotype Dd dd Gamete D d d d Fertilization Punnett Square for F1 generation F/M d d D Dd Dd d dd dd Phenotypic ratio: 1:1 Affected: Unaffected ...
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Answered by Suman C. • Biology tutor
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What causes a heart attack (also known as mycocardial infarction) and how are they treated?

During an individuals life arteries become covered in fatty plaque deposits. This causes the the inside (lumen) of the arteries to narrow. This narrowing increases the likelyhood of blockage of platelets and...
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Answered by Saskia C. • Biology tutor
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I'm confused in the difference between the cell wall and the cell membrane?

Good question. It's quite common to get both terms confused and they're both refering to a protective component of the cell. The best way to remember it is, that the membrane is present in all cell types and...
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Answered by Rahmina S. • Biology tutor
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What is osmosis and how does it differ from diffusion?

Diffusion and osmosis are very similar processes. Osmosis is a particular case of dissusion, therefore it is easier to explain the overarching theory of diffusion first. Diffusion is a gradual movement of pa...
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Answered by Sam J. • Biology tutor
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What is a synapse?

a junction between 2 neurones
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Answered by India G. • Biology tutor
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