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Genes are a section of DNA that is contained in chromosomes They are what determines the genotype the genetic makeup and phenotype the physical appearance of an organism They are two types of breeding pure breeding and cross breeding which form two main genotypes Homologous is when they have been pure breed for example GG However heterozygous is when there has been a cross and there are two different alleles the different forms of a gene an example of this is Gg A dominant gene will always override the genetics of the recessive gene such as brown hair being dominant to red hair so it is certain that the children in the first generation will have brown hair However incomplete dominance is when two genes are both dominant so they will form a blend of two alleles such as a red flower breeding with a white flower to create a pink flower Another factor affecting plant growth is environmental factors The major being sunlight without sunlight plants cannot photosynthesis Bailey R The other major environmental factor is temperature If the temperature is too cold the plant cannot photosynthesis fast enough to get nutrients and thus dies due to lack of nutrition However if the temperature is too hot the plants respiration is larger than the photosynthesis thus meaning that the nutrients are used by the plant rapidly and the plant cannot supply enough to keep it healthy In Barley plants photosynthesis occurs mainly within the leaves Since photosynthesis requires carbon dioxide water and sunlight all of these substances must be obtained by or transported to the leaves Sunlight is absorbed by chlorophyll a green pigment located in plant cell structures called chloroplasts The equation for this would be 6 CO2 6 H2OC6H12O6 6 O2Carbon dioxide Water Light energy Glucose Oxygen Bailey R Aim To investigate a single genetic trait of pigmentation growth and height in barley plantsMaterials16x Barley Seeds1x
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