Help. During which phase of meiosis could an error result in trisomy and how? А
Prophase l- an error during crossing over pulls an extra chromosome to one side of the cell
B
Metaphase 1- an error when spindle fibers attach results in an extra chromosome being created
Anaphase l- an error during random assortment pulls an extra chromosome to one side of the cell
D
Telophase l- an error when the nuclear membrane forms, it results in an extra chromosome being created

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.