Final answer:
The study suggests that females may selectively choose spermatozoa based on sex chromosomes, but this claim is not supported by the scientific consensus in reproductive biology.
Step-by-step explanation:
According to the premise given in the study, it does suggest that females might have the ability to selectively choose spermatozoa based on their sex chromosomes. It posits that ova have specific receptors for X and Y chromosome-bearing spermatozoa and that an ovum will have either X or Y receptors in a given month, determining the sex of the offspring. This would indicate a response of (a) Yes, females can selectively choose spermatozoa with either the X or Y chromosome.
Such a claim would markedly alter existing understandings of sex determination in humans, which currently recognizes that it is the chromosomal combination from both the egg (which always contributes an X chromosome) and the sperm (which may contribute either an X or a Y chromosome) that determines the sex of the offspring.
However, it is crucial to point out that this description does not reflect a recognized scientific consensus and contradicts established knowledge in the field of reproductive biology. Therefore, while the study as described may suggest selective capability, the broader scientific community does not support this claim, and further evidence would be needed to substantiate such a role of the ova in selecting sex chromosomes.