The capital S is dominate genes, the lower case s is recessive genes. From here you should get your answer!
They are all mechanisms of <u>Evolution </u>and can change allele frequencies in populations
Natural selection, mutation, genetic drift and gene flow are all capable of causing varying changes in allele frequencies in a population. and these changes leads to the violation of Hardy-Weinberg assumptions
Hardy-Weinberg assumption states that; for a population to experience an unchanged allele frequencies, certain conditions must be met by the population such as ; absence of natural, random mating , absence of migration and absence of mutation.
Hence we can conclude that Natural selection , mutation, genetic drift and gene flow are all mechanisms of <u>Evolution </u>and can change allele frequencies in populations
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Tropism is defined as the propensity of a plant to direct itself away (negative tropism) or towards (positive tropism) the stimuli. Plants that bend their roots towards a more humid environment exhibits positive hydrotropism as humidity is related to the water content of the environment.
<em>Gravitropism and geotropism have the same definition wherein plants move towards or away from gravity.</em>
The right answer would be b because as you learn more about it then it will become more clear