Question

A woman is having trouble becoming pregnant. Examination of her partner's sperm indicates that dynein feet are missing from the flagella in his sperm cells. A physician explains that this could interfere with fertility by ______________.

interfering with the attachment of the flagella to the sperm

preventing the sperm from producing enough energy to power swimming

preventing the sperm from attaching to the egg cell

preventing the sperm from swimming to the egg cell

Answer 1

Here, from the question it is clear that, in partner's sperm the dynein feet are missing from the sperm flagella.

Actually, the dynein feet are found on the micromolecules in sperm flagella and in cilia which helps in the movement of sperms by grabbing and pulling the adjacent microtubules molecule doublets.

So, if the dynein feets are absent in a sperm cell, then definetly their movement to egg cell will be in trouble, so fertilisation will be prevented.

Thus the correct answer is option (D)

preventing the sperm from swimming to the egg cell.