Practice Test 3

A conservation biologist compares two closely related populations. In Population X, meiosis includes frequent crossing over; in Population Y, crossing over is rare, but chromosome segregation is normal. Both populations have similar mutation rates. Which statement best reflects the genetic variation introduced by meiosis that could affect adaptability over generations?

In an experimental vignette, a lab times the onset of meiosis in male germ cells after a transient heat stress. They find that many primary spermatocytes proceed through meiosis I, but a checkpoint delays the start of meiosis II until DNA damage markers decrease. Based on the information, which conclusion is most consistent with gamete formation if the delay persists long enough to prevent meiosis II completion?