Question

An individual bears a dominant mutation that eliminates recombination during meiosis. This person, perhaps not surprisingly, displays reduced fertility, manifested as an increase in early miscarriages. What probably explains this infertility

Answer 1

normally crossing over leads to recombination. Crosssing over is an event during prophase I of meiosis, wherein non-sister chromatids of homologous chromosomes get exchanged and then with recombined. So that new combinations of traits having genes will be becoming assorted on recombined chromosomes. This will lead to the improved strength of the traits, so that the organisms will stay fit.

Recombination increases the genetic diversity in sexually reproducing organisms and can allow an organism to function in new ways

If a dominant mutation causes the loss of recombination then there is no chance of occurence of recombination, and which in turn causes not to form any new combinations of traits that can strengthen the organisms.

During selfing cases also, as there is no addition of new tratis, the organisms will slowly lose their strength or vigor, which is needed for the fitness of the organism to survive as a successful species in the nature.

If recombination doesn't occur, the same thing will happen that there is no successful formation of new combinations of traits that lead to the fertility, which may result in infertility.