Agroup of field biologists goes out to mark beetles living in an area around a local pond in order to estimate population size. they capture 500 beetles on the first day. they return the following day and catch a total of 400 individuals, 200 of which are marked. what is the estimated population size for the beetles?

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.