(Solved): Meiosis (3 of 3): Determinants of Heredity and Genetic Variation (BioFlix tutorial) 1 of 29 Correct ...

Meiosis (3 of 3): Determinants of Heredity and Genetic Variation (BioFlix tutorial) 1 of 29 Correct One aspect of meiosis that generates genetic variation is the random orientation of homologous pairs of chromosomes at metaphase I. Each pair can orient with either its maternal or paternal homolog closer to a given pole; as a result, each pair sorts into daughter cells independently of every other pair. Due to independent assortment alone, a diploid cell with $2n$ chromosomes can produce $2^n$ possible combinations of maternal and paternal chromosomes in its daughter cells. For the cell in this problem $(n=3)$, there are $2^3$, or 8 , possible combinations; for humans $(n=23)$, there are $2^{23}$, or 8.4 million, possible combinations. Note that when crossing over occurs, the number of possible combinations is even greater. Part C - Crossing over and genetic variation Assume that an organism exists in which crossing over does not occur, but that all other processes associated with meiosis occur normally. Consider how the absence of crossing over would affect the outcome of meiosis. If crossing over did not occur, which of the following statements about meiosis would be true? Select all that apply. View Available Hint(s) The four daughter cells produced in meiosis II would all be different. The two sister chromatids of each replicated chromosome would no longer be identical. There would be less genetic variation among gametes. The two daughter cells produced in meiosis I would be identical. Independent assortment of chromosomes would not occur.