Select the incorrect statement:

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(C) $1$. $T.H.$ Morgan worked with Drosophila melanogaster, which is correct.$2$. $ABO$ blood grouping is controlled by three alleles $(I^A, I^B, i)$,

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The sex determination in honey bee is based on the number of $X$-chromosomes.

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(C) $1$. $T.H.$ Morgan worked with Drosophila melanogaster, which is correct.$2$. $ABO$ blood grouping is controlled by three alleles $(I^A, I^B, i)$, making it a classic example of multiple alleles, which is correct.$3$. Sex determination in honey bees is based on the number of sets of chromosomes (haplodiploidy), not the number of $X$-chromosomes. Honey bees do not have the $XY$ sex-determination system. Therefore, this statement is incorrect.$4$. Starch grain size in garden pea seeds is controlled by a single gene with two alleles ($B$ and $b$), where the size of the starch grain shows incomplete dominance. This is correct.

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