When determining the number of base pairs in a genome of an organism, do you count the basepairs for both/all chromosomes in a set or just one of the chromosomes per set?

Question

For example, rice has 430 Mbp across 12 chromosomes. Rice is diploid so in total there are 24 chromosomes. Would that mean **on average** there is 430/12 Mbp per set of chromosome? Which would mean there is **an average of 430/24 Mbp per chromosome.

Please explain it like I’m a baby because I’m well confused

Edit:
Or is genome summed based on one chromosome (haploid) set?

In: 2

Answer 1

I’m not a geneticist and I’ve never determined the number of base pairs in a genome so take my answer with a pile of salt grains. That said, if I were to do so i would count both sets of chromosomes, since they will have a different set and number of base pairs. For example, the X and Y chromosome are paired during mitosis but have wildly different sets of genes on them (and the X chromosome is way bigger) so if you were to only count half of the chromosomes how would you decide which half to count? Therefore I think they count all the chromosomes not just half.