Hi, I'm trying to create a bar plot whose x-axis has several variables (measuring gene expression in two genotypes with three treatment conditions collected on various days (after disease induction)).

Ideally the graph would be depicted by day on the x-axis (0, 1, 3, 5). Each day would have genotypes in opposing colors and treatments ordered within genotype. I found this post that is similar Example graph but the answer using iris data lacks one variable (genotype).

Here's what the data look like:

# A tibble: 24 x 6

sample genotype treatment   day gene1 gene2
<dbl> <chr>    <chr>     <dbl> <dbl> <dbl>
1      1 WT       Control    0 1     0.933
2      2 WT       Treatment1 0 1.09  6.73
3      3 WT       Treatment2 0 0.759 7.78
4      4 KO       Control    0 0.725 0
5      5 KO       Treatment1 0 0.624 0
6      6 KO       Treatment2 0 0.820 0 
7      7 WT       Control    1 0.863 0.821
8      8 WT       Treatment1 1 0.991 5.45 
9      9 WT       Treatment2 1 0.871 7.21
10     10 KO       Control   1 0.634 0
# ... with 14 more rows

Thanks in advance!