I am totally new to biology and I have a very stupid question. In the typical representation of meiosis, haploid cells contain two different chromosomes, resulting from the crossing-over process. But diploid cells have two homologous copies of each chromosome, usually one from the mother and one from the father. So, since there are two identical copies of the same chromosome for each parent, it means that each haploid cell brought only one out of two chromosomes into the zygote. My question is: how is this chromosome selected? Is it a combination of the chromosomes contained into the haploid cell? Is it one of the original two, while the other one is discarded in the fertilisation process?
I'm sorry if my question is not clear. Thanks.