A student claims the probability a human sperm will receive all chromatids of maternal origin is 50 %. Explain why she is wrong.

Are the following true or false and support your answer:
i. Red blood cells and nerve cells in adult humans are suitable for karyotyping (determining the number, size, and morphology of the chromosomes)
ii. Polar bodies do not contain chromosomes.
iii. Immediately after meiosis I, cells are considered to be haploid.
iv. One tetrad/bivalent at metaphase I of meiosis consists of 2 non-identical strands of DNA.