Speaking of ranges, I think everyone wants the lowest melody note being also what ukulele can produce as a low note. Sometimes it s not possible as very often in key of C. So yes we either transpose the melody higher than written or can also transpose the song into another key. Both work.
In childrens basic education terms it can be very good if the low G ukulele is available, to cover all the basic notes that we have in treble clef. It seldom is though. But re-entrant ukes are good too, they learn the chords and able to sing along with songs.
No ukulele, not even a baritone one can offer any bass effect except to maybe some high voiced soprano singers, that baritone wierd one, buy rather a guitar. We can certainly forget things like alternating bass. You can maybe? get some effect like that with low G played in C. But it is all just instrumental only. There is no bass, none at all.
Now let's go to singing voices, mine in this case. I have a low voice and can easily sing G2, that is an octave lower than what is usually seen in song books with melody words and chords. I was in amazement that in one thread the english word was fake books? Maybe not the same thing but I see no reason to mention that anyone is faking any by playing from a song book. Anyways I can easily sing an octave lower than put in another words what low G is.
Initially before I got my ukulele, I was worried how it would work with my voice. I had trouble, especially strumming with classical guitar, because my low voice would clash with the guitar being too mellow. Then again most acoustic steel string players also have a higher voice than mine.
What I found out was that maybe my voice gives some bass that is lacking with uke. They sort of complement each other. I get the rhythm and harmony too to back up. It is ukulele sound and certainly not guitar. Suits in many songs I sing at home. To get something different I grab my steel string acoustic. Or classical to fingerpick.
Ukulele range is quite out of my singing range. I can get C, D and good days and some songs also E4.
Like in good days I can also go lower than G2 with comfort and strong and sounds good, to my ears.
I suggest you all to learn what your voice range is. Unfortunately you probably need some other instrument that can go low enough. Be it piano or guitar or accordeon etc