In a study of genetic variation of the graceland gene, a researcher finds that there are two alleles in a population. in a large sample (500 individuals), the frequency of heterozygotes is 0.63. is the population in hardy-weinberg equilibrium. you come back after 500 generations have past and observe that the frequency of heterozygotes is still 0.63. you conclude that the population is experiencing selection. which type of selection is the population most likely experiencing?

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During crossing-over, a. genetic material is exchanged between nonsister chromatids, resulting in new combinations of alleles. b. nonsister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. c. one homologous chromosome of a tetrad is exchanged with another tetrad, resulting in new combinations of alleles. d. sister chromatids from each homologous chromosome of a tetrad are exchanged, resulting in new combinations of alleles. e. genetic material is exchanged between sister chromatids, resulting in new combinations of alleles.