What is the answer for 5?? Need help thanks

Which of these is most likely to happen if parallax measurements of star distances are taken after a gap of six months? the results would be accurate the results would be inconsistent the results would not be valid the results would not be repeated

All ova contain sex chromosomes corresponding to: x y xx xy

28. how many linkage groups will be formed by homogametic organism with 28 chromosomes?