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OCR A Biology

Chlorosis Body Mass Chlorophyll Environmental Genetic Factors Examples

Chlorosis, or yellowing of plant leaves due to low chlorophyll, impairs photosynthesis and is often caused by environmental factors such as low light or mineral deficiencies. Similarly, animal body mass is a trait influenced by both genetic and environmental factors.

Chlorosis in plants, characterized by yellow or pale leaves due to reduced chlorophyll, hinders photosynthesis and is influenced by environmental factors. Lack of light, mineral deficiencies (like iron or magnesium), or viral infections can trigger this. Animal body mass is also influenced by both genetics and environment, with obesity often stemming from environmental factors but sometimes having a genetic basis.

Front Examples of characteristics that are influenced by both environment and genetics - chlorosis and animal body mass
Back
  • chlorosis is where plant forms less chlorophyll, so yellow/pale leaves and reduces ability to photosynthesise as result of environmental factors, so genetic factors code but environmental factors affect final appearence
  • due to e.g lack of light (plants turn off chlorophyll prod to conserve resources), mineral deficiencies (Fe needed as cofactor for enzymes forming chlorophyll, and Mg at heart of it), virus infections (inteferes with metabolism of cells)
  • body mass also affected by both genes and enviro, obesity results from enviro mainly, but sometimes genetic make-up (e.g mutations)

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