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This question is on meiosis: Variation occurs during meiosis, give the two ways this happens (include the phases where it occurs) (4 marks)

During prophase 1, homologous chromosomes will pair up to form a bivalent, this is where crossing over can occur. Chromatids will twist around each other and will break and reform, resulting in crossing over...
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How are stem cells used in Stargardt's disease?

Stem cells are undifferentiated cells that can give rise to different types of cells in the body from brain to muscle cells. Stem cells can be used to replace damaged or diseased cells with healthy ones. Ste...
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Describe the adaptations of the small intestine to help perform it's function

The small intestine is an organ which absorbs the products of digestion (sugars and amino acids etc) into the blood. One of the primary functions of the small intestine is to act as a large surface for absor...
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Answered by Conrad W. • Biology tutor
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Name two features of plant cells that are not features of animal cells

Chloroplasts, a plastid which contains chlorophyll and in which photosynthesis takes place. A large/permanent vacuole. Cellulose/a cell wall. Plasmodesmata.
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Answered by Fergus B. • Biology tutor
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Describe the stages of phagocytosis (4 marks)

Phagocytes (white blood cells) recognise pathogens via receptors and chemoattractionPhagocytes engulf the pathogen, forming an intracellular compartment called a phagosome Lysosomes fuse with the phagosome t...
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