Question with Mitosis and Meiosis?

ok i read that in Mitosis when the chromosomes duplicate they are identical to eachother but when i moved on to study meiosis i learned that the chromosomes in mitosis are logous chromosomes d they have the same genes in the same sequence but can have different alleles. So if the alleles are different for example one allele would could for blue and the other codes for red then the chromosomes would not be identical. Are logous chromosomes only in Meiosis? How are the chromosomes in meiosis logous if they are duplicated. Also which diploid cells divide to make 4 haploid cells? Which cells undergo meiosis? I thought it was sperm and egg cells but then i realized the cell must start with 46 chromosomes which duplicate to 92 so each of the 4 haploid cells can have 23 and can then can fertilize an egg cell or be fertilized. Thank you sooo much :)