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Introduction A gene is the smallest physical piece of heredity It determines what features we will pass on to our children as well as which ones we have gained from our biological parents Hair Replacement Portland 2007 Gregor Mendel the Father of Genetics patiently refined and tested at least 28 000 pea plants over a number of years He observed what happened and conceived the concept of heredity units now called genes He also identified dominant and recessive characteristics Even though Mendel used pea plants the same tests can be replicated on barley plants The plants produced will contain a number of traits a genetically determined characteristic Google Dictionary nd The trait that is dominant in a barley plant is green pigmentation and the recessive is white or albino pigmentation A dominant trait is the trait that shows up in an offspring and recessive trait is the one masked by a dominant gene ParkinD ParkinM nd Dominant and recessive traits share a relationship They will give various genotypes and phenotypes There will be two genotypes and three phenotypes in this relationship There is also incomplete dominance This is when there will be three genotypes and three phenotypes The phenotype is what determines the pigmentation of the barley if it will be white albino or green The dominant trait will always win over the recessive trait This will mean that some barley plants will be more favourable than others because the dominant green barley seed will grow whereas the recessive albino barley seed will not The green barley seed would have the pigmentation and chlorophyll and the white albino seed will not resulting in the plant dying as it cannot produce photosynthesis leading to no growth and no life Aim Part A to investigate and identify all crosses that could occur with punnet squares and compare this to the growth of the plants then identify the genotype of the parents by observing the phenotype
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