BIO SCI 97 Chapter Notes -Phenotype, Heredity, Zygosity
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Mendel"s approach: make initial observations, formulate a testable hypothesis, design an experimental test and collect data, analyze the results and compare them to the predictions from the hypothesis, accept the hypothesis or reformulate it. All f1 progeny appear identical and resemble one parent -they don"t look in-between". When f1 are self-mated, they give rise to some progeny that resemble and some that do not resemble the f1 parents. The f1 plants are not true-breeding and they contain two different traits. These ideas are the basis of mendel"s law of segregation. Traits are controlled by particles of heredity or alleles. Phenotype is controlled by genes that have different alleles. These particles can be dominant or recessive to the other. Alleles can be dominant or recessive the recessive phenotype is only seen in homozygotes. Individuals contain two particles that segregate into pollen and egg. Individuals are diploid and alleles segregate into gametes.